Sanjay-Dubri National Park and Tiger Reserve was established in 1975 to conserve the biodiversity rich forest area of the district. Comprising an Evergreen Sal forest, it is home to about 152 species of birds 32 species of mammals, 11 species of reptiles, 03 species of amphibian and many more, 34 species of fresh water fishes. The major species found are tiger, Sloth bear, Chital, Nilgai, Chinkara, Sambar (limited to hilly terrain and in very small number), leopard, Dhole (wild dog), Jungle Cat, Hyena, Porcupine, Jackal, Fox, Indian Wolf, Indian Python Four-horned Antelope and Barking deer.
Sanjay National Park which is a part of Sanjay-Dubri Tiger Reserve is the most popular place to visit. The Tiger Reserve comprises Sanjay National Park and the Dubri Wildlife Sanctuary, both of which cover more than 831 sq.km and are located in Sidhi District. The area with its large size and rich biodiversity, is well-known. It has Sal, Bamboo and mixed forests.
