The national park is one of the most protected and untouched areas of rain forests and tropical moist evergreen forest in the South Western Ghats.
Mukurthi peak, the fifth-highest peak in South India, and Anginda peak are also located in its vicinity.
Bhavani River, a tributary of Kaveri River, and Kunthipuzha River, a tributary of Bharathappuzha river, originate in the vicinity of Silent Valley.
The Kadalundi River has also its origin in Silent Valley.
41 mammals, 211 birds, 49 reptiles, 47 amphibians, 12 fishes, 164 butterflies and 400 species of moths are found here.
Lion tailed macaques is the flagship species of the Park.
The indigenous tribal groups that live within park boundaries include Irulas, Kurumbas, Mudugas and Kattunaikkars, the ethnic heritage of these communities is well protected.
Karimpuzha Wildlife Sanctuary, New Amarambalam Reserved Forest, and Nedumkayam Rainforest in Nilambur Taluk of Malappuram district, Attappadi Reserved Forest in Mannarkkad Taluk of Palakkad district, and Mukurthi National Park of Nilgiris district, are located around Silent Valley National Park.
