Qeys Island

Also spelled  Qais,  Persian  Jazireh-ye Qeys,   island in the Persian Gulf, lying about 10 miles (16 km) off mainland Iran. It rises 120 feet (37 m) above sea level to a plateau and is almost without vegetation except for a few date groves and stunted herbage. Qeys attained importance only in the late 1st millennium AD, when a prince obtained it, built a fleet, and gradually extended his power. He captured Siraf (modern Taheri), then a large market,