 prior to the 610s, and in the early Islamic era, the Sulaym inhabited the northern Hejaz, with the Harrah volcanic field forming the heart of their territory.The latter was formerly named "Ḥarrat Banī Sulaym" after the tribe.It was an ideal defensive region as enemy horsemen could not manage its terrain or enter its eastern and western slopes, where the Sulaym had their "ḥimās" (protected pastures).