Description
A deep glacial pothole 20 ft in diameter carved in granite at the base of a waterfall some 25,000 years ago. Sand, stones, and water have polished its sides smooth.
Grafton County · New Hampshire
A deep glacial pothole 20 ft in diameter carved in granite at the base of a waterfall some 25,000 years ago. Sand, stones, and water have polished its sides smooth.