| Western Ghats | |
|---|---|
| Sahyadri Mountains | |
 |
|
| Highest point | |
| Peak | Anamudi (Eravikulam) |
| Elevation | 2,695 m (8,842 ft) |
| Coordinates | 77°04′E 77°04′E |
| Dimensions | |
| Width | 100 km (62 mi) E–W |
| Area | 160,000 km (62,000 sq mi) |
| Geography | |
 to the west coast of India |
|
| Country | India |
| States | |
| Settlements | Ooty, Mahabaleshwar, Madikeri and Munnar |
| Biome | forests |
| Geology | |
| Period | Cenozoic |
| Type of rock | Basalt and Laterite |
| Natural Properties - Western Ghats (India) | |
|---|---|
| Name as inscribed on the World Heritage List | |
 |
|
| Country | India |
| Type | Natural |
| Criteria | ix, x |
| Reference | 1342 |
| UNESCO region | Indian subcontinent |
| Inscription history | |
| Inscription | 2012 (36th Session) |
The Western Ghats or the Sahyādri constitute a mountain range along the western side of India. It is a UNESCO World Heritage Site and is one of the eight "hottest hotspots" of biological diversity in the world. It is sometimes called the Great Escarpment of India. The range runs north to south along the western edge of the Deccan Plateau, and separates the plateau from a narrow coastal plain along the Arabian Sea. A total of thirty nine properties including national parks, wildlife sanctuaries and reserve forests were designated as world heritage sites - twenty in Kerala, ten in Karnataka, five in Tamil Nadu and four in Maharashtra.
The range starts near the border of Gujarat and Maharashtra, south of the Tapti river, and runs approximately 1,600 km (990 mi) through the states of Maharashtra, Goa, Karnataka, Tamil Nadu and Kerala ending at Kanyakumari, at the southern tip of India.
These hills cover 160,000 km (62,000 sq mi) and form the catchment area for complex riverine drainage systems that drain almost 40% of India. The Western Ghats block rainfall to the Deccan Plateau. The average elevation is around 1,200 m (3,900 ft).
The area is one of the world's ten "Hottest biodiversity hotspots" and has over 5000 species of flowering plants, 139 mammal species, 508 bird species and 179 amphibian species; it is likely that many undiscovered species live in the Western Ghats. At least 325 globally threatened species occur in the Western Ghats.
The Western Ghats are not true mountains, but are the faulted edge of the Deccan Plateau. They are believed to have been formed during the break-up of the super continent of Gondwana some 150 million years ago. Geophysicists Barron and Harrison from the University of Miami advocate the theory that the west coast of India came into being somewhere around 100 to 80 mya after it broke away from Madagascar. After the break-up, the western coast of India would have appeared as an abrupt cliff some 1,000 m (3,300 ft) in elevation.
Basalt is the predominant rock found in the hills reaching a depth of 3 km (2 mi). Other rock types found are charnockites, granite gneiss, khondalites, leptynites, metamorphic gneisses with detached occurrences of crystalline limestone, iron ore, dolerites and anorthosites. Residual laterite and bauxite ores are also found in the southern hills.
The Western Ghats extend from the Satpura Range in the north, go south past Maharashtra, Goa, through Karnataka and into Kerala and Tamil Nadu. Major gaps in the range are the Goa Gap, between the Maharashtra and Karnataka sections, and the Palghat Gap on the Tamil Nadu and Kerala border between the Nilgiri Hills and the Anaimalai Hills.
The major hill range starting from the north is the Sahyadhri (the benevolent mountains) range. This range is home to many hill stations like Matheran, Lonavala-Khandala, Mahabaleshwar, Panchgani, Amboli Ghat, Kudremukh and Kodagu. The range is called Sahyadri in Maharashtra, Karnataka and Sahya Parvatam in Kerala.
The Nilgiri Hills,also known as the Nilagiri malai, are in northwestern Tamil Nadu. The Nilgiri Hills are home to the hill station Ooty. The Bili giri rangana Betta southeast of Mysore in Karnataka, meet the Shevaroys (Servarayan range) and Tirumala range farther east, linking the Western Ghats to the Eastern Ghats. In the South, the range is or Nilgiris in Tamil Nadu.
South of the Palghat Gap are the Anaimalai Hills, in western Tamil Nadu and Kerala. Smaller ranges are further south, including the Cardamom Hills.
In the southern part of the range is Anamudi peak 2,695 metres (8,842 ft) in Kerala the highest peak in Western Ghats. Chembra Peak 2,100 metres (6,890 ft), Banasura Peak 2,073 metres (6,801 ft), Vellarimala 2,200 metres (7,218 ft) and Agasthya mala 1,868 metres (6,129 ft) are also in Kerala. Doddabetta in the Nilgiri Hills is 2,637 metres (8,652 ft). Mullayanagiri is the highest peak in Karnataka 1,950 metres (6,398 ft). The Western Ghats in Kerala and Tamil Nadu is home to many tea and coffee plantations.
The northern portion of the narrow coastal plain between the Western Ghats and the Arabian Sea is known as the Konkan Coast or simply Konkan, the central portion is called Kanara and the southern portion is called Malabar region or the Malabar Coast. The foothill region east of the Ghats in Maharashtra is known as Desh, while the eastern foothills of the central Karnataka state is known as Malenadu. The largest city within the mountains is the city of Pune (Poona), in the Desh region on the eastern edge of the range. The Biligirirangan Hills lies at the confluence of the Western and Eastern Ghats.
The mountains intercept the rain-bearing westerly monsoon winds, and are consequently an area of high rainfall, particularly on their western side. The dense forests also contribute to the precipitation of the area by acting as a substrate for condensation of moist rising orographic winds from the sea, and releasing much of the moisture back into the air via transpiration, allowing it to later condense and fall again as rain.
Following is a list of some of the highest peaks of the Western Ghats:
| Rank | Name | Elevation (m) | Location |
|---|---|---|---|
| 01. | Anamudi | 2695 | Idukki, Kerala |
| 02. | Meesapulimala | 2640 | Idukki, Kerala |
| 03. | Doddabetta | 2637 | Nilgiris, Tamil Nadu |
| 04. | Kolaribetta | 2629 | Mukurthi National Park, Tamil Nadu |
| 05. | Mukurthi | 2554 | Mukurthi National Park, Tamil Nadu |
| 06. | Vandaravu Peak | 2553 | Palani Hills Wildlife Sanctuary and National Park, Tamil Nadu |
| 07. | Kattumalai | 2552 | Eravikulam National Park, Kerala |
| 08. | Anginda peak | 2383 | Silent Valley National Park, Kerala |
| 09. | Vavul Mala | 2339 | Vellarimala, Kerala |
| 10. | Velliangiri Peak | 2240 | Coimbatore, Tamil Nadu, |
| 11. | Kodaikanal | 2133 | Kodaikanal, Tamil Nadu |
| 12. | Chembra Peak | 2100 | Wayanad, Kerala |
| 13. | Elivai Malai | 2088 | Palakkad, Kerala |
| 14. | Banasura Peak | 2073 | Wayanad, Kerala |
| 15. | Kottamalai | 2019 | Periyar National Park, Kerala |
| 16. | Mullayanagiri | 1930 | Chikmagalur, Karnataka |
| 17. | Baba Budangiri | 1895 | Chikmagalur, Karnataka |
| 18. | Kudremukh | 1894 | Chikmagalur, Karnataka |
| 19. | Agasthyamalai | 1868 | Tirunelveli, Kanyakumari, Tamil Nadu and Thiruvananthapuram, Kerala |
| 20. | Biligiriranga Hills | 1800 | Chamarajanagar, Karnataka |
| 21. | Tadiandamol | 1748 | Kodagu, Karnataka |
| 22. | Kumara Parvata | 1712 | Dakshina Kannada, Karnataka |
| 23. | Pushpagiri | 1712 | Pushpagiri Wildlife Sanctuary, Karnataka |
| 24. | Kalsubai | 1646 | Ahmednagar, Maharashtra |
| 25. | Brahmagiri | 1608 | Kodagu, Karnataka |
| 26. | Salher | 1567 | Nashik, Maharashtra |
| 27. | Madikeri | 1525 | Kodagu, Karnataka |
| 28. | Himavad Gopalaswamy Betta | 1450 | Chamarajanagar, Karnataka |
| 29. | Torna Fort | 1405 | Pune, Maharashtra |
| 30. | Purandar fort | 1387 | Pune, Maharashtra |
| 31. | Raigad fort | 1346 | Raigad district, Maharashtra |
| 32. | Kodachadri | 1343 | Shimoga, Karnataka. |
The Western Ghats have several manmade lakes and reservoirs. The well known lakes are the Ooty (2500 m altitude, 34.0 ha) in Nilgiris, and the Kodaikanal (2285 m, 26 ha) and the Berijam in the Palani Hills. The Pookode lake of Wayanad in Kerala at Lakkadi is a beautiful scenic one with boating and garden arrangements. Most of the bigger lakes are situated in the state of Tamil Nadu. Two smaller lakes, the Devikulam (6.0 ha) and the Letchmi Elephant (2.0 ha) are in the Munnar range.
The majority of streams draining the Western Ghats and joining the Rivers Krishna and Kaveri carry water during monsoon months only and have been dammed for hydroelectric and irrigation purposes. The major reservoirs are: Lonavala and Walwahn in Maharashtra; V.V. Sagar, K.R. Sagar and Tungabhadra in the Malenadu area of Karnataka; Mettur Dam, Upper Bhavani, Mukurthi, Parson's Valley, Porthumund, Avalanche, Emerald, Pykara, Sandynulla, Karaiyar, Servalar, Kodaiyar, Manimuthar Dam and Glenmorgan in Tamil Nadu; and Kundallay and Maddupatty in the High Range of Kerala. Of these the Lonavla, Walwahn, Upper Bhavani, Mukurthi, Parson's Valley, Porthumund, Avalanche, Emerald, Pykara, Sandynulla, Glenmorgan, Kundally and Madupatty are important for their commercial and sport fisheries for trout, mahseer and common carp.
The Western Ghats form one of the four watersheds of India, feeding the perennial rivers of India. Important rivers include the Godavari, Krishna and Kaveri. These rivers flow to the east and drain out into the Bay of Bengal. The west flowing rivers, that drain into the Arabian Sea, are fast-moving, owing to the short distance travelled and steeper gradient. Important rivers include the Mandovi and Zuari. Many of these rivers feed the backwaters of Kerala and Maharashtra. Rivers that flow eastwards of the Ghats drain into the Bay of Bengal. These are comparatively slower moving and eventually merge into larger rivers such as the Kaveri and Krishna. The larger tributaries include the Tunga River, Bhadra river, Bhima River, Malaprabha River, Ghataprabha River, Hemavathi river, Kabini River. In addition there are several smaller rivers such as the Chittar River, Manimuthar River, Kallayi River, Kundali River, Pachaiyar River, Pennar River, Periyar and the Kallayi River.
Fast running rivers and steep slopes have provided sites for many large hydro-electric projects. There are about 50 major dams along the length of the Western Ghats with the earliest project up in 1900 near Khopoli in Maharashtra. Most notable of these projects are the Koyna Hydroelectric Project in Maharashtra, the Parambikulam Dam in Kerala, and the Linganmakki Dam in Karnataka. The reservoir behind the Koyna Dam, the Shivajisagar Lake, has a length of 50 km (31 mi) and depth of 80 m (262 ft). It is the largest hydroelectric project in Maharashtra, generating 1,920 MW of electric power. Another major Hydro Electric project is Idukki dam in Kerala. This dam is one of the biggest in Asia and generates around 70% of power for Kerala state. Mullai Periyar dam near Thekkady is one of the oldest in the world and a major tourist attractions in Kerala. Water from this dam is drawn to the vast coastal plain of Tamil Nadu, forming a delta and making it rich in vegetation.
During the monsoon season, numerous streams fed by incessant rain drain off the mountain sides leading to numerous and often spectacular waterfalls. Among the most well known is the Jog Falls, Kunchikal Falls, Sivasamudram Falls, and Unchalli Falls. The Jog Falls is the highest natural plunge waterfall in South Asia and is listed among the 1001 natural wonders of the world. Talakaveri wildlife sanctuary is a critical watershed and the source of the river Kaveri. This region has dense evergreen and semi-evergreen vegetation, with shola-grassland in areas of higher elevation. The steep terrain of the area has resulted in scenic waterfalls along its many mountain streams. Sharavathi and Someshvara Wildlife sanctuaries in Shimoga district are the source of the Tungabhadra River system.The Netravathi river has also its origin at western ghats of India flowing westwards to join Arabian sea at Mangalore.
Climate in the Western Ghats varies with altitudinal gradation and distance from the equator. The climate is humid and tropical in the lower reaches tempered by the proximity to the sea. Elevations of 1,500 m (4,921 ft) and above in the north and 2,000 m (6,562 ft) and above in the south have a more temperate climate. Average annual temperature here are around 15 °C (60 °F). In some parts frost is common, and temperatures touch the freezing point during the winter months. Mean temperature range from 20 °C (68 °F) in the south to 24 °C (75 °F) in the north. It has also been observed that the coldest periods in the south western ghats coincide with the wettest.
During the monsoon season between June and September, the unbroken Western Ghats chain acts as a barrier to the moisture laden clouds. The heavy, eastward-moving rain-bearing clouds are forced to rise and in the process deposit most of their rain on the windward side. Rainfall in this region averages 3,000–4,000 mm (120–160 in) with localised extremes touching 9,000 mm (350 in). The eastern region of the Western Ghats which lie in the rain shadow, receive far less rainfall averaging about 1,000 mm (40 in) bringing the average rainfall figure to 2,500 mm (150 in). Data from rainfall figures reveal that there is no relationship between the total amount of rain received and the spread of the area. Some areas to the north in Maharashtra while receiving heavier rainfall are followed by long dry spells, while regions closer to the equator receiving less annual rainfall, have rain spells lasting almost the entire year.
The Western Ghats are home to four tropical and subtropical moist broadleaf forest ecoregions – the North Western Ghats moist deciduous forests, North Western Ghats montane rain forests, South Western Ghats moist deciduous forests, and South Western Ghats montane rain forests.
The northern portion of the range is generally drier than the southern portion, and at lower elevations makes up the North Western Ghats moist deciduous forests ecoregion, with mostly deciduous forests made up predominantly of teak. Above 1,000 meters elevation are the cooler and wetter North Western Ghats montane rain forests, whose evergreen forests are characterised by trees of family Lauraceae.
The evergreen Wayanad forests of Kerala mark the transition zone between the northern and southern ecologic regions of the Western Ghats. The southern ecologic regions are generally wetter and more species-rich. At lower elevations are the South Western Ghats moist deciduous forests, with Cullenia the characteristic tree genus, accompanied by teak, dipterocarps, and other trees. The moist forests transition to the drier South Deccan Plateau dry deciduous forests, which lie in its rain shadow to the east.
Above 1,000 meters are the South Western Ghats montane rain forests, also cooler and wetter than the surrounding lowland forests, and dominated by evergreen trees, although some montane grasslands and stunted forests can be found at the highest elevations. The South Western Ghats montane rain forests are the most species-rich ecologic region in peninsular India; eighty percent of the flowering plant species of the entire Western Ghats range are found in this ecologic region.
Historically the Western Ghats were well-covered in dense forests that provided wild foods and natural habitats for native tribal people. Its inaccessibility made it difficult for people from the plains to cultivate the land and build settlements. After the arrival of the British in the area, large swathes of territory were cleared for agricultural plantations and timber. The forest in the Western Ghats has been severely fragmented due to human activities, especially clear felling for tea, coffee, and teak plantations during 1860 to 1950. Species that are rare, endemic and habitat specialists are more adversely affected and tend to be lost faster than other species. Complex and species rich habitats like the tropical rainforest are much more adversely affected than other habitats.
The area is ecologically sensitive to development and was declared an ecological hotspot in 1988 through the efforts of ecologist Norman Myers. Though this area covers barely five percent of India's land, 27% of all species of higher plants in India (4,000 of 15,000 species) are found here. Almost 1,800 of these are endemic to the region. The range is home to at least 84 amphibian species, 16 bird species, seven mammals, and 1,600 flowering plants which are not found elsewhere in the world.
The Government of India established many protected areas including 2 biosphere reserves, 13 National parks to restrict human access, several wildlife sanctuaries to protect specific endangered species and many Reserve Forests, which are all managed by the forest departments of their respective state to preserve some of the ecoregions still undeveloped. Many National Parks were initially Wildlife Sanctuaries. The Nilgiri Biosphere Reserve comprising 5500 km² of the evergreen forests of Nagarahole, deciduous forests of Bandipur National Park and Nugu in Karnataka and adjoining regions of Wayanad, Mudumalai National Park and Mukurthi National Park in the states of Kerala and Tamil Nadu forms the largest contiguous protected area in the Western Ghats. The Western Ghats is home to numerous serene hill stations like Munnar, Ponmudi and Waynad. The Silent Valley National Park in Kerala is among the last tracts of virgin tropical evergreen forest in India.
Regarding the Western Ghats, in November 2009, Minister of Environment and Forests, Jairam Ramesh said,
"The Western Ghats has to be made an "ecologically sensitive zone". It is as important as the ecological system of the Himalayas for protection of the environment and climate of the country. The Central government will not give sanction for mining and hydroelectric projects proposed by the State Governments of Maharashtra, Karnataka and Goa that will destroy the Western Ghats eco-system.’’
In a letter dated 20 June 2009, Mr. Ramesh said,
“The (proposed) 200-MW Gundia hydel project of Karnataka Power Corporation in Hassan district would drown almost 1,900 acres (7.7 km) of thick forest in the already endangered Western Ghats along with all its fauna. This is something that both Karnataka and our country can ill-afford." "Power generation should not happen at the cost of ecological security."
The Expert Appraisal Committee appointed by Union Government also said that the project should not be taken up.
In August, 2011, the Western Ghats Ecology Expert Panel (WGEEP) designated the entire Western Ghats as an Ecologically Sensitive Area (ESA) and, assigned three levels of Ecological Sensitivity to its different regions.
In 2006, India applied to the UNESCO MAB for the Western Ghats to be listed as a protected World Heritage Site. In 2012 following 39 places are declared as World Heritage Sites:
The Western Ghats are home to thousands of animal species including at least 325 globally threatened species. Many are endemic species, especially in the amphibian and reptilian classes. Thirty two threatened species of mammals live in the Western Ghats. Of the 16 endemic mammals, 13 are threatened
Great Hornbill from Valparai
Golden-Backed Woodpecker
Blue-winged Parakeet
Crested Hawk Eagle
Peacock
Crested Serpent Eagle
Green Bee Eater
Longtailed Shrike
Magpie Robin
Nilgiri Pipit
Red Vented Bulbul
Red Whiskered Bulbul
Tiger at Bhadra Wildlife Sanctuary
The endemic land snail Indrella ampulla
Phallus indusiatus fungus found in Sahyadri range
Creatures in Kundadri Hills
The damp forested slopes are the original location of Piper nigrum, the black pepper of history and commerce.
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