Rajiv Gandhi Orang National Park is the oldest game reserve in Assam. It is spread over 78.81 sq km of alluvial flood plains of the many rivers. The park is an integral part of the Indo-Burma biodiversity hotspot. It was once occupied by the tribal population but abandoned due to a epidemic breakout in the region. Today, it is an important breeding ground for many fish varieties as many as 50. Mammals, reptiles, amphibians, avians and flora inhabit the sanctuary.
Mammals found here are one horned Rhinoceros, Tiger, Maljuria Elephants, Hog Deer, Wild Pig, Civet Cat, Porcupine and Gangetic Dolphin. 222 species of Birds have so far been recorded. Some birds identified are Spot Billed Pelican, White Pelican, Greater Adjutant Stork, Lesser Adjutant Stork, Brahminy Duck, Pintail Duck, Bengal Florican, etc. Migratory birds are also spotted. The best time to visit in November to April, the park offers exciting adventures.