The Wei River is a significant river in northern China, flowing through the Shaanxi province. It is approximately 1,000 kilometers long and serves as a major tributary of the Yellow River. The river plays a crucial role in the region's agriculture and water supply. The Wei River originates from the Qinling Mountains and flows eastward, passing through several cities, including Xi'an. Its basin is known for fertile land, supporting various crops. The river has historical importance, as it has been a vital waterway for transportation and trade throughout Chinese history.