Keelung Nuannuan pothole is a pothole or kettle hole in the exposed bed of the Keelung River at Nuannuan District, Keelung City in Taiwan. A pothole is a circular depression on the river bed carved out of solid rock. It is formed by a kind of drilling action as pebbles are caught in eddy currents and whisked around within a small natural crack or hollow. As time passes, the drilling action enlarges the hollow to form a pothole. Potholes are commonly found below waterfalls or rapids where hydraulic action is a significant process.
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