Wei River, or Wei He, a river in China. It is about 450 miles (720 km) long. The Wei's source is in the mountains of southern Gansu province. From there it flows eastward across Shaanxi province through a fertile valley that was one of the earliest centers of Chinese civilization. The historic city of Xi'an is in the valley. The river is navigable for 80 miles (130 km) from the vicinity of Xi'an to where it joins the Huang He, or Yellow River.
Central Asia, an indefinite region in the interior of Asia. It is generally considered to extend in a broad band from the Caspian Sea into the Xinjiang region of China, covering roughly the same area as Turkestan.
Tonle Sap, a lake in central Cambodia, drained by the Tonle Sap River. During the rainy season the lake receives water from many streams, mainly the flooding Mekong River, and greatly increases in size, inundating surrounding areas.