Nepal has vast sources of fresh water river which flows from high mountains of north to southern plain. This river collect all minerals rich fertile soil to this plain which helps to develop good environment for plants. In addition, humid and hot weather helps to create more dense forest in this plain. Large parts of this plain is covered with dense forest and vegetation. Many flora fauna and wild life flourish in this dense jungle. This dense forest are protected by creating parks and reserves. It is looked after by government and international organization. 16% of Nepal total land is covered by reserves and conservation areas.
It was established in 1976 and was named as Royal Karnali Wildlife Reserve with 368 sq km area. But later more area including Babai River Valley was added. Now it is largest wildlife reserve of Nepal with area of 968 sq. km. It is also most undisturbed reserves. Most of the area of the reserve is covered with dense jungle. It is home to wide range of wild life and birds. One-horned Rhino and Bengal tiger is key wildlife that are found in this reserve and needs conservation effort. It is many legally protected wild life species. One-horned Rhinoceros, wild Asian Elephant, Bengali Tiger, Gangetic Dolphin, Swamp Deer, Black Buck Antelope, and Gharial Crocodile the endangered birds include the Bengal Florican, the Silver-eared Mesia and the Sarus Crane are species that are found in the reserves that are protected by law in Nepal.