These ruins belong to the oldest mosque in Bahrain. According to local tradition, it dates back to the 8th century. However, archaeologists are less certain, preferring the 12th-13th centuries. Its two circular minarets, standing 21 metres high, frame the prayer hall, which is punctuated by pillars and columns supporting a wooden framework. In front of the building, a trench left by archaeologists reveals the basin used for ritual ablutions. An alleyway has been uncovered, with its rows of shops indicating a souk.