Glacial potholes are unique geological features formed by the erosive action of glaciers. As glaciers move over bedrock, they can create depressions by grinding and scouring the surface. When water, often from melting ice, collects in these depressions, it can further erode the rock, leading to the formation of deep, rounded holes. These potholes can vary in size and depth, depending on the strength of the glacier and the type of rock beneath. They are commonly found in areas that were once covered by glaciers, such as parts of the Northern Hemisphere and regions like New England in the United States.