Kalpong River is a river in the North Andaman islands in the Andaman and Nicobar Islands.[1] It originates from the Saddle Peak.[2] The Kalpong River traverses in the northward direction for a length of about 35 kilometres before it joins the Aerial Bay Creek on the east coast near Diglipur.[3] Kalpong Hydroelectric project having capacity of 5.25 MW,[3] the first hydro electric project in North Andaman is commissioned on the river. The project is expected to generate 14.83 million units of electricity annually.[3]