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Baghdad (/ˈbæɡdæd, bəɡˈdæd/; Arabic: بَغْدَاد [baɣˈdaːd] (About this soundlisten)) is the capital of Iraq and the second-largest city in the Arab world after Cairo. It is located along the Tigris near the ruins of the ancient Akkadian city of Babylon and the Sassanid Persian capital of Ctesiphon. In the eighth century, Baghdad was chosen as the capital of the Abbasid Caliphate, and became its most notable major development project. Within a short time, the city evolved into a significant cultural, commercial, and intellectual center of the Muslim world. This, in addition to housing several key academic institutions, including the House of Wisdom, as well as a multiethnic and multi-religious environment, garnered it a worldwide reputation as the "Center of Learning".
Baghdad was the largest city in the world for much of the Abbasid era during the Islamic Golden Age, peaking at a population of more than a million.[3] The city was largely destroyed at the hands of the Mongol Empire in 1258, resulting in a decline that would linger through many centuries due to frequent plagues and multiple successive empires. With the recognition of Iraq as an independent state (formerly the British Mandate of Mesopotamia) in 1932, Baghdad gradually regained some of its former prominence as a significant center of Arab culture, with a population variously estimated at 6 or over 7 million.[note 1] Compared to its large population, it has a small area at just 673 square kilometers (260 sq mi).
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