This sanctuary extends over the Thodupuzha and Udumpanchola taluks of Idukki district, spreading over 77 sq. km and is about 450 - 748 m above sea level. The Idukki Reservoir formed by three dams - Cheruthoni, Idukki and Kulamavu - extends to 33 sq km.

There is a scenic lake around the sanctuary, covered by an enchanting canopy of tropical ever-green and deciduous trees, and offers boat rides. Elephants, bisons, bear, wild boars, sambar wild dogs, jungle cats, tiger, wild boar etc are seen here apart from various species of snakes including cobra, viper, kraits and numerous non-poisonous ones. Birds include jungle fowl, myna, laughing thrush, black bulbul, peafowl, woodpecker, kingfisher etc.

Animals : Elephant, bison, sambar deer, wild dog, jungle cat, tiger, wild boar etc.
Snakes : Cobra, viper, krait and a number of non poisonous snakes.
Birds    : Jungle fowl, myna, laughing thrush, black bulbul, peafowl, woodpecker, kingfisher etc.

Kuthumkal Waterfalls
The misty waterfall provides a picturesque view of the water, cascading down from scintillating heights. The sheer beauty of the place allures thousands of visitors every year.

Observatory Hills
This is a beautiful hill located at Nedumkandam. It's a perfect location for people who are interested in watching the heavenly bodies, as the sky here is free from pollution. Nearby trekking trails: Palkulamedu, Parakulam, Kulamavu, Anaward, Painavu, Anamudi.