5 Rivers in Southwest Asia Euphrates River. The Euphrates River, which passes through Turkey, Syria and Iraq, is about 1,700 miles long and the longest river of Southwest Asia. Tigris River. The Tigris River — Tigris means “fast” or “arrowlike” in Old Persian — runs about 1,180 miles in length. Aras River. Karun River. Jordan River. Click to see full answer. Just so, why are the major rivers in southwest Asia important?It then flows along the border between Kuwait and Iran and empties into the Persian Gulf. The rivers provide water for both drinking and farming. The countries that share these rivers have had problems over how the water should be shared.Also Know, what are the three major river systems in Southwest Asia? Three Major Rivers: Tigris River. Euphrates River. Jordan River. In this way, which rivers are the longest and most important in Southwest Asia? At 1,300 feet (396 m) below sea level, it ranks as the world’s lowest body of water, and its shore represents the lowest land elevation. Southwest Asia’s two longest and most important rivers are the Tigris and the Euphrates, which are often considered parts of the same river system.What are the major landforms of Southwest Asia?The most distinctive landform in Southwest Asia is the Arabian Peninsula, which is separated from the continent of Africa by the Red Sea on the southwest and from the rest of Asia by the Persian Gulf on the east. The Red Sea covers a rift valley created by the movement of the Arabian plate.