جرحا

Also known as Gerra

thumbnail|Kingdom of Gerrha in 100 BC. thumb|Gerrha and its neighbors in AD 1.Gerrha () was an ancient and renowned city within Eastern Arabia, on the west side of the Persian Gulf. Known from Greek sources, it has been identified with a few candidate archaeological sites in Eastern Arabia, with the main candidates being Hagar (modern-day Hofuf) and Thaj.