The Park spans over an area of 820sq. Km which includes Rajaji, Motichur and Chilla wildlife sanctuaries, parts of Dehradun, Siwalik and Lansdowne Forest Divisions. These three sanctuaries were amalgamated in 1983 to Rajaji National Park, named after the Late Raja Gopal Chariya. The majestic Ganges flows through the National Park for a distance of 24km, besides the innumerable streams and brooks making it rich and diverse. It offers ample opportunities to nature lovers to enjoy the captivating landscape and wildlife.
Rajaji is thickly foliated predominantly by the Sal Forest and a number of other forest types which include the Western Gangetic Moist and Northern dry Deciduous and Khair-Sissoo forests. Low Alluvial Savannah Woodlands cover the drier southern margins of the park, in contrast to the Siwalik Chir-Pine on the high reaches of the hills.