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
Kill (body of water) Kill (body of water) A kill is a body of water, most commonly a creek, but also a tidal inlet, river, strait, or arm of the sea. The term is derived from the Middle Dutch "kille" ("kil" in modern Dutch), meaning "riverbed" or "water channel". It is found in areas of Dutch influence in the Netherlands' former North American colony of New Netherland, primarily the Hudson and Delaware Valleys. Examples of the freestanding use of "kill" or "kull" are: "Kill" is also joined with a noun to create a composite name for a place or body of water: The single