The Baiheliang (White Crane Ridge) is a stone riff submerged by the new Three Gorges Dam on the Yangtze River. It features some of the world’s oldest hydrological inscriptions, which recorded 1,200 years of changes in the water level of the river. Since the first year of Guangde period of the Tang Dynasty (763 AD), people had started to carve fish  on this natural stone ridge to record the lowest water level in the year. It was believed that when the water receded and the stone fish appeared the next year would see bumper crops as the saying predicted "out of the water appear the rock fish, out of the field come rich crops."

People of different dynasties carved onto the stone ridge the time of the appearance of the stone fish, the distance from the stone fish to the low water line as well as the observers' name and the scene in the form of poems.  There are 18 rock fish carvings, one in relieve, two in bass-relief, and 15 in line engraving. The ridge shows also an engraved crane, a boddhisvatta figure and poems.

The launch of the Three Gorges Project causes the stone ridge to be submerged under the water surface of the reservoir. To protect this valuable cultural relic and enable the public to see this historical landscape, the authorities concerned have designed an underwater museum. It is open to the public and is located in Fuling.