Tigris–Euphrates river system border. Since the 1960s and in the 1970s, when Turkey began the GAP project in earnest, water disputes have regularly occurred in addition to the associated dam's effects on the environment. In addition, Syrian and Iranian dam construction has also contributed to political tension within the basin, particularly during drought. The general climate of the region is subtropical, hot and arid. At the northern end of the Persian Gulf is the vast floodplain of the Euphrates, Tigris, and Karun Rivers, featuring huge permanent lakes, marshes, and forest. The aquatic vegetation includes reeds, rushes, and papyrus, which support numerous species. Areas
Liao River million people. In 1958, the upriver of the Wailiao River at Liujianfang was blocked off via a river engineering project, redirecting the water flow from the Liao River "proper" entirely towards the Shuangtaizi River, effectively separating the Hun River and Taizi River from the main body of Liao River system. Therefore, since 1958, the Hun River and Taizi River were no longer considered tributaries of the Liao River, but an autonomous water system of their own. These following tributaries drain into the Liao River "proper" throughout its course within the Liaoning Province. Liao River The Liao River () is the