Mangan is a town and the headquarter of the district of Mangan District in the Indian state of Sikkim. The town lying near River Teesta is connected to the capital Gangtok by a metalled road. Mangan District is the largest district of Sikkim in terms of area. The town lies in the geographic south of the district. After the opening up of the district, Mangan has witnessed a spurt in its economy, mostly due to organic farming. The town opens up the Tibetan Plateau.