This castle was built outside the town of Zubarah with a channel and four walls lying between the town and the fort as well as a cemetery some outside the town. It was a fortified and was built to oversee and protect the town from any invaders. Inside the fort was a masjid known as Murair Masjid as well a well two fathoms deep, and outside the fort there are five wells one fathom deep, and all of its water is fresh.