Idukki Wildlife Sanctuary which came into existence in 1976 and is spread over an area of 105.364 sq Km and is situated at an altitude of 450-748 m above sea level. The sanctuary lies adjacent to the world renowned Idukki Arch Dam in the Thodupuzha and Udumpanchola taluks of the district. However, the dam has entry restrictions and is open to public only during holiday seasons. The land-locked district, Idukki is one of the most nature-rich areas of Kerala.
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Elephants, bison, sambar deer, 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 grey jungle fowl, Malabar grey hornbill, several species of woodpeckers, bulbuls, flycatchers, etc.
The sanctuary occupies the forest land between the Cheruthoni and Periyar rivers. There is a scenic lake around the sanctuary, covered by an enchanting canopy of tropical ever-green and deciduous trees, and offers boat rides. The wildlife here is similar to that of Thekkady.
The forest here is similar to that of Periyar Reserve. Most forests are evergreen and semi evergreen. You may also come across patches of Shola forests and grass lands.
One of best ways to sight animals is boating in the reservoir. Herds of elephants and other animals are seen at the banks as it is the major water source within the sanctuary.
Idukki Sanctuary is a daytime sightseeing spot, where the action is mostly treks and boat rides. Idukki Wildlife Sanctuary is a less crowded not so hyped alternative compared to the Periyar Tiger Reserve and Thekkady. The lake of Kizhakkilachimala and its surrounding forests are very scenic. Equally impressive is the view of two dams (Idukki & Cheruthoni) from Hill Valley Park.