pothole (geology); giant's kettle
Geological term for a cylindrical hole formed in bedrock by water erosion, often in rivers. Also called 甌穴 (おうけつ).
See also: 甌穴
Many large potholes can be seen in the upper reaches of this river.
Commonly used for holes in road surfaces. In everyday Japanese, 穴ぼこ (あなぼこ) is also used.
See also: 穴ぼこ (あなぼこ)
After the rain, a pothole had formed in the road.