Houtong Coal Mine Introduction
The potholes of the Keelung River are a world-class geological landscape, typically found in the upstream regions of rivers. The formation of potholes is caused by strong swirling currents carrying sand and gravel, which erode the riverbed. Over time, the continual action of the flowing water creates circular holes known as potholes. Between Hou Dong Station and San Diao Ling Station on the Pingxi Line in Ruifang District, the riverbed of the Keelung River cuts into the hard Nuan Nuan sandstone layer, resulting in many smooth depressions on the rock surface, which are scientifically referred to as potholes, forming the Keelung River pothole landscape. Ruifang's Houtong is the most accessible place to view the potholes. From the Weng Zai Tan Bridge under the visitor service center of the Houtong Coal Mine Museum Park, walking upstream along the stepped embankment for about 1,700 meters, which takes about 30 minutes one way, you can see the Houtong potholes, locally known by Ruifang residents as "the dimples of the stones." Additionally, after exiting Houtong Railway Station, you can walk along Houtong Road upstream towards the Keelung River to see the pothole scenery as well.
