Kooh-e Khajeh (Kajeh Mountain), with 120m height and 2-2.5km in diameter, is located at Hamoon Lake like an island. Since the archaic era, due to its specific geopolitical location, religious sacredness, and the natural beauty especially at the times of water-richness at Hamoon, this place caused the formation of settlements. Based on an intensive archaeological survey conducted in this region, seventeen sites have been identified of which thirteen possess earthenware. Through typological and chronological studies of potteries found at surface level, two era of settlement have been identified in this Mount: one refers to the pre-Islam era beginning from 3rd century B.C. until the end of Sassanians; the second belongs to the Islamic era particularly on the basis of glazed potteries scattered on the surface as well as some structures built during 6th and 8th century Hegira. The buildings and structures related to the pre-Islam era include palaces, defensive forts and citadels, and temples, whereas; the buildings of the Islamic era are exclusively related to some religious places such as shrines, mausoleums and cemeteries.