Dahua Pot Hole Introduction
The valley landscape of the Keelung River features numerous smooth depressions known as "potholes" located between Pingxi Station and Sandiaoling, in addition to waterfalls. The formation of potholes results from uneven structural hardness in the geological rock layers, where river water carrying fine sand scours the bedrock to create depressions, followed by small whirlpools within these depressions that cause further erosion, resulting in the formation of these hollow, cup-like cavities. Potholes typically occur in river meanders where there are numerous eddies and swift currents, with bare hard rock making up the riverbed. The most concentrated and observable group of potholes can be found below Dahua Station, where, due to the interaction between the water flow and rock layers, almost every type of pothole can be observed, making it a natural geographic classroom.
