The Nokrek Biosphere Reserve is situated in the northeast of India on the Tura Range. Nokrek is the highest peak of the Garo hills, with an altitude of 1,412 meters. The north of the reserve embraces undulating hills, while steep slopes characterize the south. The biosphere reserve contains major rivers and streams that form a perennial catchment system. It includes the Ganol, Dareng and Simsang rivers. Among these, the Simsang is the longest and largest and originates in the north of the Biosphere Reserve. The Dareng has is origin in the southern peaks, and the Ganol flows westward into the Brahamputra River, which supplies water to numerous towns. Nokrek is the highest peak in West Garo Hills, and has a huge population of rare plants and teems with wild life. Nokrek hill is the home of a very rare species of citrus locally known as Memang Narang. Literally translated it means orange of the spirits. This Memang Narang is considered to be the most primitive and progenitor of all other varieties of citrus plants in the world .With a view to preserve this rare species of citrus indica the first gene sanctuary of the world has been established here. The park has been listed as UNESCO’s Biosphere Reserve and has an area of about 47 sq km. Park boasts of varied wildlife, including herds of wild elephants, animal species like leopard, pangolin, python, hornbill, and rare orchids. The last few red pandas have their home in this place. Bird species like hornbill, peacock and pheasant can be also spotted here. Other major attractions include Simsang River Game Reserve, Ronbang Dare Waterfalls and the Nokrek Peak.