Kaziranga National Park is known worldwide for its success in the conservation history of one horned Indian Rhinoceros. Playing host to a number of threatened species and migratory birds, it stands as a symbol of dedication for the conservation of endangered species animals and their habitat. With a UNESCO World Heritage Site status, it represents the single largest protected area in North East India, Assam. Spread over the Civil jurisdictions of Nagaon and Golaghat districts in Assam, the mighty Brahmaputra river flows to its North and to the South of it stands Karbi Anglong hills. Geographically, it is located between Longitude 92"50' E & 93" 41' E and Latitude 26" 30'N and 26" 50' N.
The entire Kaziranga National Park area was formed by the alluvial deposits of the Brahmaputra River and its smaller tributaries. The rivers carry a great amount of silt during the
rainy season every year. The riverine area thus formed is colonised by saccharum and other grass species as soon as the landmasses are stabilized. But sometimes, before other tree species could take root on such landmasses, the landmass gets eroded. Probably numerous channels of the Brahmaputra river criss-crossing the entire area were once flowing through Kaziranga in the past and in course of time silt depositions and changing course of the Brahmaputra river formed into the 'Beels' (water bodies/ lakes) of various sizes and depth. This process of erosion and formation of landmasses are still going on along the Northern Boundary of Kaziranga National Park.
The Hoollongapar Gibbon Sanctuary renamed on 25 May 2004, formerly known as the Gibbon Wildlife Sanctuary or Hollongapar Reserve Forest, is an isolated protected area of evergreen forest located in Jorhat district of Assam, India. The sanctuary was officially established and renamed in 1997. In the early 1900s, artificial regeneration was used to a develop well-stocked forest, resulting in the site's rich biodiversity. The Hoollongapar Gibbon Sanctuary contains India's only gibbons - the hoolock gibbons, and Northeastern India's only nocturnal primate - the Bengal slow loris. The upper canopy of the forest is dominated by the Hollong tree, while the Nahar dominates the middle canopy. The lower canopy consists of evergreen shrubs and herbs.
Orang National park is the oldest game reserve of the State just on the northern bank of river Brahmaputra with an area of 78.80 sq. kms and it is an important breeding ground for varieties of Fishes. It is located on the north bank of the Brahmaputra River in the Darrang and Sonitpur districts of Assam, India. It was established as a sanctuary in 1985 and declared a National Park on 13 April 1999. It is also known as the mini Kaziranga National Park (IUCN site) since the two parks have a similar landscape made up of marshes, streams and grasslands and are inhabited by the Great Indian One-Horned Rhinoceros. The park has a rich flora and fauna, including Great Indian One-Horned Rhinoceros, pigmy hog, elephants, wild buffalo and tigers. It is the only stronghold of rhinoceros on the north bank of the Brahmaputra river.
Pobitora National Park is situated in the Marigaon district of the state of Assam. The national park is located about 48 km by from Guwahati. It is a 1-hour drive through a road passing by River Brahmaputa, and a small portion of the village of Mayong. It has a dense population of the Great Indian one-horned rhinoceros. It covers 38.8 km2. Though the total notified area of the park is 38.80 square kms, only 16 square kms is the effective rhino habitat. Pobitora was declared a reserved forest in 1971 and a wildlife sanctuary in 1987. It covers flat flood plains and a hillock (Raja Mayong).