Amir Kabir dam (Persian: سد امیر کبیر‎), also known as Karaj dam, is a dam in Iran, located 63 kilometres (39 mi) northwest of Tehran and 23 kilometres (14 mi) north of Karaj. Amir kabir Dam was constructed on the Karaj River, and was the first multi-purpose dam in Iran. The ecliptic concrete structure is 180 metres (590 ft) high, with 30 metres (98 ft) length on bottom and 390 metres (1,280 ft) on top and its watershed is 764 kilometres (475 mi) long. (after Wikipedia)