Hotobi Reservoir is located in Tainan City, which is the river basin of Shu County. It was built in 1846 AD, to store water and irrigate farmland. During the Japanese occupation, the authorities repaired dams, built gates, and beautified the banks of the lake. At that time, the area of the Hotobi Water District had expanded to about 0.27 square kilometres. In 1954, it was selected as one of the "Eight Scenic Spots in Nanning" by the Tainan Provincial Documentation Committee entitled "Hubei Fanyu", and today it has become a major picnic area in Tainan urban area, a place where the flag-raising ceremony is held every day From the days of the new year.