Chungthang is situated in the North Sikkim District at the confluence of Lachen and Lachung Chu rivers. There is a forward base and a medical centre of the Indian army in this town.
About 95-km away from Gangtok en route to Yumthang lies the tiny hamlet of Chungthang at the confluence of the two rivers, the Lachen Chhu (which later evolves into the Teesta) and the Lachung Chhu. A notable feature is a footprint atop a rock, which is said to be that of Guru Padmasambhava.