The Palni Hills lies to the east, extending into Kerala as the Pampadum Shola National Park.

[citation needed] Their geological formation is metamorphic gneiss, veined with feldspar and quartz, and interspersed with reddish porphyrite.

Eravikulam National Park, Chinnar Wildlife Sanctuary, Idamalayar Reserve Forest, Mankulam Forest division Parambikulam Wildlife Sanctuary, and Anamalai Tiger Reserve located among these hills are well known for elephants.

The Idamalayar Dam area is a major wildlife spot, along with Pooyamkutty and Aanakkulam.

Numerous wildlife species can be seen including elephants, gaur, water buffaloes, tigers, panthers, sloth bears, pangolins, black-headed orioles, crocodiles, green pigeons, civet cats, dhole, sambar, black buck, and 31 groups of endangered lion-tailed macaques.

[citation needed] The Anaimalai Hills are a popular trekking destination in the Western Ghats.

Due to heavy rains during the wet season, the ideal time for tourism is between the months of November and May.