The Park has got the largest area representing Shiwalik Eco-system. The Shivalik trail is 10 million year old and very rich in fossils. It's fossils faunal remains include about 50 species of elephant, one of them is present today.
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 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 Shiwalik Chir-Pine on the high reaches of the hills.
The park is home to the Tiger, Leopard, Himalayan Bear, Cheetal, hog deer, barking deer, Sambar deer, wild boar, antelopes such as the Nilgai, Goral , Jackal, Hyena, Jungle Cat, Leopard Cat, Civets, Himalayan Yellow-Throated Marten, Sloth Bears, Pythons, King Cobra, Common Krait, Indian Cobra and the Monitor Lizard and above All the Asian Elephant.