[citation needed] Namdapha National Park is located in Changlang district of the Northeast Indian state of Arunachal Pradesh, near the international border with Myanmar.

It is crossed from east to west by the Noa Dihing River that originates at the Chaukan Pass on the Indo-Myanmar border.

Secondary forests cover 345.47 km2 (133.39 sq mi); seasonal snow occurs above 2,700 m (8,900 ft) between December and March.

[1][6] Sapria himalayana and Balanophora are root parasites related to Rafflesia recorded from the area.

Other rare, restricted range or globally endangered species include the rufous-necked hornbill, green cochoa, purple cochoa, beautiful nuthatch, Ward's trogon, ruddy kingfisher, blue-eared kingfisher, white-tailed fish eagle, Eurasian hobby, pied falconet, white-winged wood duck, Himalayan wood-owl, rufous-throated hill-partridge, and whitecheeked hill partridge.

[3] The first mid-winter waterfowl census in Namdapha was conducted in 1994 when species such as the white-bellied heron, a critically endangered bird, was recorded for the first time.

As per the observations taken during the National Camp organised in October 2014 by Bombay Natural History Society, a lot of rare species of butterflies were seen.

These include the koh-i-noor, naga treebrown, red caliph, cruiser, wizard, fluffy tit, East Himalayan purple emperor.