What is the deepest point of Lake Superior?

The deepest point of Lake Superior is about 406 metres below the lake’s surface.

This extreme depth is in the lake’s northern part, near the Ontario–Minnesota border. Lake Superior is the deepest of the Great Lakes and contains more water than any other lake in the group.

Its basin was carved and reshaped by repeated continental glaciations. The rugged shoreline, steep underwater slopes, and exposed bedrock reflect that geological history. Despite its depth, the lake can develop extensive winter ice in sheltered bays, although its entire surface rarely freezes.

Depth figures can vary slightly among references because surveys use different measurements and lake levels change. The commonly cited maximum is approximately 406 metres, not 406 feet. That distinction matters: 406 metres is more than 1,300 feet.