Bahrain is a historical region in eastern Arabia that is known as the Province of Bahrain until the 16th Century.

It stretches from the south of Basra along the Persian Gulf coast and includes the regions of Southern Iraq, Kuwait, Al-Hasa, Qatif, Qatar, and the Awal Islands, now known as Bahrain.

The name "Bahrain" refers to the eastern mainland Arabia until at least the 18th century.