The Relli River is a small Himalayan river in the Indian states of Sikkim and West Bengal, flowing near Kalimpong. The source of the Relli lies in between the Alagara - Lava forest range at an elevation of known as Tiffin Dara and ends at 800 ft, confluence with the teesta . The river runs less than from central Kalimpong, separated by Deolo Hill. The main tributary are Khani River and Pala River and flows into the Teesta River about to the south of central Kalimpong.