Ad-Dahnā'

Sand stretches across the northern approaches to Sudayr, near the country of Zilfi. The nearby Nufud al-Thuwayrat forms a long belt of dunes west of the Tuwayq heights, narrowing toward the south. Its northern sands lie close to, but are distinct from, the great arc of ad-Dahna. Wind has piled the sand into high domes and ridges, interrupted in places by lower rocky ground.