Arad Fort (Arabic: قلعة عراد; transliterated: Qal'at 'Arad) is a 15th century fort in Arad, Bahrain. Arad Fort was built in the typical style of Islamic forts during the 15th century A.D. before the Portuguese invasion of Bahrain in 1622 A.D. This fort is one of the compact defensive forts in Bahrain. In its present location, it overlooks various sea passages of Muharraq's shallow seashores. In the past, there was an inaccessible marine channel which was controlled by the local people to prevent ships from breaking through to the island where the fort is located. The fort is square and on every corner there is a cylindrical tower. It is surrounded by a small trench which used to be filled with water from wells that were drilled especially for this purpose. In every corner of the upper wall of the fort there are nose shaped openings for marksmen.