The salt reeds has a large area approaching the western Nafud (the ancient lands). It reaches the east to the road coming from Riyadh to Al-Qasab. Some of its features appear in the form of flowers of salts and marshes in the streams of the lower valleys. Since the ground is completely flat in the swamp land, This leveling is a natural result; Sediments formed the surface and water made it level. These marshy lands are surrounded by less salty land. Due to the quality of its soil, it became a farm that cultivated its wheat crops, especially during heavy rains