Manamah, Al (äl mänämˈä) [key], town (1991 pop. 127,578), capital, commercial center, and largest city of Bahrain, on the Persian Gulf. It has oil refineries and light industries and is a free port. The National Museum and a Qur'an museum are in the town, and the command of the U.S. Fifth Fleet is based there. A causeway links the town with the island of Al Muharraq.