Tabriz ( ; ) is the most populous city in northwestern Iran, one of the historical capitals of Iran and the present capital of East Azerbaijan Province. It is the fifth-most-populous city in Iran. In the Quru River valley in Iran's historic Azerbaijan region between long ridges of volcanic cones in the Sahand and Eynali mountains, Tabriz's elevation ranges between above sea level. The valley opens up into a plain that gently slopes down to the eastern shores of Lake Urmia, to the west. With cold winters and temperate summers, Tabriz is considered a summer resort. It was named World Carpet Weaving City by the World Crafts Council in October 2015 and Exemplary Tourist City of 2018 by the Organisation of Islamic Cooperation.