It is a Bani Waqef fortress and was built in Al-Madinah Al-Munawwarah. According to some narratives, the Prophet (Peace be upon him) prayed there. This fortress is located north of as-Saffia Well, slightly to the east. There are parts of it that remain. It is characterized by its architectural construction, basements constructed with stone and Lime mortar structure, and the size of the fortress, which is almost 50 meters. It is about 4 kilometers south of Al-Masjid an-Nabawi and half a kilometer southeast of Masjid Quba. It has been constructed for roughly fourteen centuries.