Lar Dam (Persian: سد لار sad-de lār) is a dam located at the foot of Mount Damavand in Amol county, Mazandaran, Iran. The dam is located within the protected Lar National Park and situated just 70 kilometers northeast of the capital and the most populous city of the country, Tehran. The primary purpose of the dam is municipal water supply to Tehran but prior to the water reaching the city filtration plant, it is used to power the Kalan and Lavarak Hydroelectric Power Stations, with a combined installed capacity of 162.5 MW.