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Hongqiqu or Red Flag Canal is an irrigation canal located 80 km northwest of Anyang in the northern extremity in Henan, China. At the Tiger's Mouth Cliff, the Red Flag Canal is built on the side of a cliff. Close to the border of Hebei and Shanxi. The canal diverts water from the Zhang River into a canal. The Zhang River flows from Shanxi and becomes the border between Hebei and Henan near to Handan. The dam is located near the corner of the three provinces. The canal winds around the side of a cliff, through 42 tunnels and along the side of the Taihang Mountains. The main canal is 71 kilometres long with many branches to distribute the water. 

The canal was initiated during the Great Leap Forward and was built in the 1960s and the main channel was completed in 1965. It was dug entirely by hand labour. The canal is 71 kilometers long, including the distribution branches, the irrigation system is claimed to have a total length of 1500 meters. 

The Red Flag Canal was considered to be a famous achievement of the Chinese workers in the 1960s and was the subject of several movies. The Red Flag Canal was featured in propaganda both internal and external to China, as an exemplar of what diligent workers could achieve and local mass initiative.

Linzhou (then called Linxian) and the Red Flag Canal were visited by the Italian film director Michelangelo Antonioni when he made his film Chung Kuo, Cina documentary about China during the Cultural Revolution in 1972.