Western Asia's longest river is the Euphrates River. It stretches for approximately 1,740 miles (2,800 kilometers) through various countries including Turkey, Syria, and Iraq. The Euphrates River has played a crucial role in the history of civilization, with several ancient civilizations flourishing along its banks. It is a vital water source for irrigation, agriculture, and provides hydroelectric power to the region. The Euphrates River holds both historical and ecological significance in Western Asia.