Pakke Wild Life Sanctuary and Tiger Reserve falls within the Eastern Himalaya Biodiversity Hotspot. This mountain park drained by many rivers like Bhareli(or Kameng) Nameri, Khari and Upper Dikorai. The sanctuary slopes southwards towards the Brahmaputra Valley and there are highest hills in the northern areas of the sanctuary. Towards the South and South-East, the sanctuary adjoins reserve forest and the Nameri National Park of Assam. Doimara Reserve Forest and Eaglenest Wild Life Sanctuary are located to the west of Pakke.
Area: 861.95 sq. km
Altitude: 150 to 1,500 msl
Rainfall:2,500 mm (Average)
Temperature: 7˚C to 35˚C
Monsoon: December to April (North-East Monsoon)
May to September (South-west monsoon) 1/3 of annual rainfall
Cold: November to February
Driest: October & November
Vegetation: Tropical semi-evergreen forest, Tropical wet evergreen, Sub-tropical Broadleaf hill forest.
Mammals: The sanctuary is extremely rich in mammals, reptiles, amphibians and insects. Pakke WLS offers a good change of encountering Asian Elephant, Gaur, Barking deer, Sambar, wild pig and four species of squirrel including Malayan Giant and oallas Red-Bellied squirrels. Apart from this the sanctuary is home of Assamese macaque, Capped langur, Slow loris including big carnivore fauna like Royel Bangle Tiger, Leopard, Clouded leopard, black bear, Wild dog, jackal.
Birds: More than 300 avian species have been recorded from this sanctuary so far. Some of them are globally threatened and range species like White Winged Duck, Rufous-Nacked Hornbill, Pallas's Fish Eagle, Black-Tailed Crack, Pale-Headed Woodpecker, Greet Hornbill, White-Cheeked Hill-Partridge, Rufous-Throated Wren-Babbler, Hoary-Throated Barwing, White-Naped Yuhina, Broad-Billed Flycatcher Warbler, Marsh Babbler to the plain areas towards south etc.