Niṣāb

Nisab lies where Wadi Dura and Wadi Abadan meet to form Wadi Hammam in southern Yemen. The meeting of these valleys places it among the routes and irrigable lands of the dry interior. In the sixteenth century the town was ruled by the Umm Rusas family, against whom neighbouring Awlaki groups made an attack. Nisab later became associated with a branch of the Awlaki rulers, whose territories extended across the valleys between the highlands and the coast.