Dahua Pot Cave Introduction
The valley landscape of the Keelung River includes many smooth hollows known as "potholes" between Pingxi Station and Sandiaoling, in addition to waterfalls. The formation of potholes results from the uneven structural hardness of geological rock layers, which are eroded by river water carrying fine sand, creating depressions. Subsequently, small whirlpools formed in the depressions further erode them, leading to the creation of pot-shaped cavities. Potholes typically appear in the concave areas of meandering rivers with many whirlpools and swift currents, where the riverbed is made up of exposed hard rock. The Dihua pothole group below Dihua Station is the most concentrated and observable area, showcasing nearly all types of potholes due to the interaction between water flow and rock layers, making it a natural geography classroom.
