Rahat, Harrat
"Saudi Arabia's largest lava field, 20,000 sq km Harrat Rahat extends for 300 km south of the holy city of Al Madinah (Medina). Four coalescing lava fields erupted from offset NNW-trending vent systems comprise Harrat Rahat, which has an average width of 60 km. Lava flows extend as far as 100 km west of the axis of the field. Basaltic scoria cones dominate Harrat Rahat, but the volcanic field has also produced more silicic trachy-basaltic to trachytic rocks. Small shield volcanoes and pelean-type lava domes with associated pyroclastic-flow and -surge deposits are also present. Activity has migrated to the north, resulting in eruptions in historical time near Madinah. The best-known eruption took place in 1256 AD, when a 0.5 cu km lava flow erupted from six aligned scoria cones and traveled 23 km to within 4 km of Madinah."  -Smithsonian Volcano Archive
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