Shirvan (from ; ; Tat Persian: Sirvan), also spelled as Sharvan, Shirwan, Shervan, Sherwan and Šervan, is a historical region in the eastern Caucasus, known by this name in both Islamic and modern times. Today, the region is an industrially and agriculturally developed part of the Azerbaijan Republic that stretches between the western shores of the Caspian Sea and the Kura River and is centered on the Shirvan Plain.