Harrat Khaybar, one of Saudi Arabia's largest volcanic fields, covers an area of more than 14,000 km2 N of Madinah (Medina). A 100-km-long N-S linear vent system contains felsic lava domes, tuff rings, the Jabal Qidr stratovolcano, and numerous small basaltic cones. At least seven lava flows are less than 4,500 years old, and another eight are less than 1,500 years old. In the latter category is the 55-km-long Habir lava flow as well as Jabal Qidr stratovolcano, the only stratovolcano in the Harrats of western Saudi Arabia. An eruption was reported in early Mohammedan times during the 7th century CE. Lavas from Harrat Khaybar overlap older lavas of Harrat Kura to the west and merge with lavas from Harrat Ithnayn to the north.