GENERAL KNOWLEDGE

Detailed explanation-1: -Surrounded by four countries (Iran, Iraq, Turkey, and Syria), the Tigris River is the second largest river in western Asia. With the Euphrates, it makes up a river system that borders Mesopotamia in the area known as the Fertile Crescent.

Detailed explanation-2: -The Tigris–Euphrates river system is a large river system in Western Asia which discharges into the Persian Gulf. Its principal rivers are the Tigris and Euphrates along with smaller tributaries. Tigris, Euphrates, Greater Zab, Lesser Zab.

Detailed explanation-3: -It comprises the Tigris and Euphrates rivers, which follow roughly parallel courses through the heart of the Middle East. The lower portion of the region that they define, known as Mesopotamia (Greek: “Land Between the Rivers”), was one of the cradles of civilization.

Detailed explanation-4: -The Euphrates is the longest river of Western Asia. It emerges from the confluence of the Kara Su or Western Euphrates (450 kilometres (280 mi)) and the Murat Su or Eastern Euphrates (650 kilometres (400 mi)) 10 kilometres (6.2 mi) upstream from the town of Keban in southeastern Turkey.