Nagarhole National Park being an important part of the Nilgiri Biosphere Reserve (which comprises the Nagarhole, Bandipur, Mudumalai and Wayanad Reserves), the park stretches over 643-square kilometers and is separated from Bandipur by the Kabini Reservoir. The park has rich forest cover, small streams, valleys, and waterfalls and a healthy tiger-predator ratio; and tiger, Indian bison, and elephant are much more populous here than in Bandipur.