The Emirate was located geographical region of Jizan in what is now southwestern Saudi Arabia. The authority of the Emir was restricted to a strip of the Tihamah some 80 miles (130 km) long and extending about 40 miles (64 km) inland to the scarp of highland Asir, with Sabya as capital and Jizan and Midi as ports.
R.L. Headley, ʿAsīr, Encyclopaedia of Islam, Second Edition.
A. K. Bang, The Idrisi State of Asir 1906-1934: Politics, Religion and Personal Prestige as State-building factors in early twentieth century Arabia, Bergen Studies on the Middle East and Africa (1996)