Marid Castle is one of the most important archeological monuments in the province of Saudi arabia. It is an archaeological castle constructed from mud and stones overlooking the town of Dumat Al-Jandal from a height of 600 meters tall hill. Its walls are 80 cm - 1 meter (2'8"-3'3") thick. The castle commanded the old city of Adumato. Excavations made by Khaleel Ibrahim al-Muaikel in 1986 added to observations made in 1976 that a homogeneus layer of Roman-Nabataean pottery sherds indicated a prosperous community during the time of the Nabataeans.