Tigris–Euphrates river system through the central plain and combine at Al-Qurnah to form the Shatt al-Arab and discharge into the Persian Gulf. The region has historical importance as part of the Fertile Crescent region, in which civilization is believed to have first emerged. The ecoregion is characterized by two large rivers, the Tigris and Euphrates. The rivers have several small tributaries which feed into the system from shallow freshwater lakes, swamps, and marshes, all surrounded by desert. The hydrology of these vast marshes is extremely important to the ecology of the entire upper Persian Gulf. Historically, the area is known as Mesopotamia. As
Euphrates Volcano of Tell Abyad from ISIL in July 2015 was a major success of the Euphrates Volcano operations room. On 10 October 2015, the Euphrates Volcano was one of the founding members of the Syrian Democratic Forces. Soon after the formation of the SDF, the Euphrates Volcano was superseded by various other groups and military councils within the SDF. It was one of the few operations rooms which had been set up by non-government forces during the civil war that were able to transform into a "semi-stable" alliance. Euphrates Volcano Euphrates Volcano () was a joint operations room/coalition established during the