Located next to the Qasr Marid, built at the time of the second caliph. Umar Bin Al Khatab passed in Dumat Al Jandal on his way to Al Quds (Jerusalem).
Umar Mosque is situated in Dumat Al-Jandal, a major intersection of ancient trade routes linking Mesopotamia, Syria with Arabia. The Mosque was built in 634-644.
The north wall of the mosque faces the Marid Fort across a street. On its other three sides, it is surrounded by dense urban fabric. Like any other old town mosque, the stone construction composes of a courtyard preceding the main prayer hall to the south and another space to the north also used for prayer. The minaret is at the southwestern corner of the prayer hall bridging over a street. The mosque is entered through a door situated in the qibla wall, near the minaret. The prayer hall is formed by three rows of stone pillars, running parallel to the qibla wall. The pillars are all by wooden lintels, which in turn support layers of stone that are roofed by mud-plastered acacia and palm trunks.
The mihrab is a narrow, corbeled niche in the center of the qibla wall and is defined by a similar niche with three built-in stone steps to its right. The mihrab, the minbar, and the lower part of the qibla wall are plastered with white wash. Viewed from the outside, one sees that the mihrab and minbar protrude slightly out of the qibla wall. Also visible is an exposed stone staircase constructed along the qibla wall from the street side that reaches the roof. The minaret shaft has a rectangular shape that tapers upward to end in a pyramidal form. The four internal floors of the shaft were accessed by a now-collapsed spiral staircase entered from within the mosque. On each side of the minaret, and on each floor, a rectangular window with a stone lintel provides lighting for its interior.