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| Area |
777 sq. km. |
| Location |
Longitude:76º 55’- 77º 26’ E, Latititude:9º 16’ – 9º 40’ N |
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| North |
Peermedu taluk |
| South |
Pathanamthitta district |
| East |
Theni,Tirunelveli & Ramnad districts of Tamil Nadu |
| West |
Kottayam district |
Terrain & Geomorphology
Terrain is undulating with lofty peaks of over 1700 meters bordering the north and east. Towards the west it merges into an extensive tableland Mount Plateau of average elevation 1200 meters.
From the edge of this plateau the land falls steeply to the thickly forested tracts of Sabarimala hills in the Pamba River basin.
The overall elevation ranges from 100 meters at Pambavalley to 2019 meters at Kottamalai.
| Rock |
granites and gneisses |
| Soil |
laterite, fine loamy, with large amount of quartz gravel formed from crystalline rock. |
Climate & Rain fall
The temperature ranges from 15ºC in December and January and up to 31ºC in April & May.
The Annual rainfall ranges from 2000 mm to 3000 mm.
Two–thirds of the rainfall occurs during the southwest monsoon from June to September. The northeast monsoon impacts from October to December. There are some pre-monsoon showers from mid April.
Rivers
Periyar and Pamba
Area of lake : 26 sq. km. (at max. water level)
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