Longtan Temple is located in Dongshan, Chengdu, but it still belongs to Dujiangyan irrigation area. Here, the water network is dense, Longtan Temple is low-lying, and the temple is surrounded by a winding river. No matter how the river rises, the Great Hall of Longtan Temple has never been flooded. 198 1 The flood in Chengdu flooded the Mishi Dam at the entrance of Longtan Kingdom, and the low-lying Longtan Temple was not spared. However, only Ursa Major kept the flood out of the threshold. The local people think that this place is where Long Mai is, and the Ursa Mahayana Hall is the foundation of Buddhism, so the flood dare not approach. As a result, there are thousands of wonders of ancient temples that are not afraid of water.