The Karun-4 hydroelectric dam will produce 1,000 megawatts of electricity from its four turbines, the same volume as will be generated at the Bushehr Nuclear Power Plant, whenever it is completed. The new dam is 250 meters (755 feet) high and will eventually create a reservoir 29 square kilometers (11 square miles) in size. The Karun is Iran’s largest river, and the only one that is navigable. It rises in the mountains of the Bakhtiari district in the Zagros Range before passing through Ahvaz, the capital of Khuzestan province, and then joining the Shatt al-Arab at Khorramshahr. In the Biblical tradition, Karun is the Pishon, one of the four rivers of the Garden of Eden, the others being the Tigris, Euphrates and the Karkheh (Gihon in the Bible).