Global Volcanism Program | Image GVP-10463
The large dark wedge-shaped area near the center of this Space Shuttle image is Harrat 'Uwayrid, a major volcanic field in NW Saudi Arabia that contains basaltic scoria and tuff cones. Bedouin legends say that Hala-'l-Bedr erupted fire and stones in 640 CE, killing herdsmen and their cattle and sheep. Another volcanic field, Harrat ar Rahah (top-left), lies to the NW.
NASA Space Shuttle image STS37-152-84, 1991 (http://eol.jsc.nasa.gov/).