Baqubah (Arabic: بَعْقُوبَة; BGN: Ba‘qūbah; also spelled Baquba and Baqouba) is the capital of the Diyala Governorate of Iraq. The city is located some 50 km (31 mi) to the northeast of Baghdad, on the Diyala River. In 2003 it had an estimated population of some 280,000 people.
Baqubah served as a way station between Baghdad and Khorasan on the medieval Khorasan Road. During the Abbasid Caliphate, it was known for its date and fruit orchards, irrigated by the Nahrawan Canal. It is now known as the centre of Iraq's commercial orange groves. During the Iraq war, Baqubah served the capital of Al Qaeda in Iraq as well as the Islamic State of Iraq, the predecessors of the Islamic State.