> The capital of Iraq is located on which river?And the answer: Tigris. As the capital of Iraq, Baghdad is located on the Tigris River, in the heart ofwhat was once ancient Mesopotamia[https://www.askqotd.com/the-cradle-of-civilization/]. The Tigris River is oneof the most important waterways in what's known as the Fertile Crescent, as itflows from the mountains of southeastern Turkey, through Syria and Iraq, andempties into the Persian Gulf.Baghdad on the Tigris River. Credit: Britannica.com.The country we know as Iraqwas only founded in 1958, yet the city at its heart was established over 1,200years ago. At the time of its foundation, Baghdad was considered to be thegreatest city in the Medieval Period. It is said that the Abbasid caliphAl-Mansur himself travelled up the length of the Tigris to find the perfectplace for his capital city in 762 CE, and ultimately landed in the region whichwould soon become Baghdad. Over 100,000 workers from all over the Muslim Empire convened to buildAl-Mansur's new capital city, which he designed himself. Al-Mansur laid plansfor a circular city with one inner wall and two more outer walls, the farthestof which measuring in at around 80 feet wide. At 12 miles in diameter, thecenter of the city held the Golden Palace of the caliph and his family, as wellas the Grand Mosque. In only 4 years, the city was completed. Al-Mansur namedhis city Madīnat al-Salām, or, "City of Peace."Photo credit: muslimheritage.com [https://muslimheritage.com/baghdad/].Immigrants of all kinds came to settle in the new city. Soon, it began to spreadoutside its walls, and reached its height in 900-1200 CE with an estimated1,200,000 to 2,000,000 residents. Beautiful parks, gardens, and villas decoratedthe city, with fresh water flowing to each home through the use of aqueducts.Colleges, hospitals, and libraries (including the largest library in the worldat the time) began to crop up, and the city earned a cemented place of culturalsignificance on the world stage.