Mount Rainier
Mount Rainier has 26 major glaciers. In total, there are  of permanent snow and glacial ice on the mountain making it the most heavily glaciated peak in the lower 48 states. At the top are two Volcanic craters, both more than  in diameter. The east crater is larger and overlaps the western crater. Heat from the volcano keeps areas along the edge of the craters free of snow and ice and has created the world's largest glacier cave network inside the craters with almost  of passages. A small crater lake that is about  deep lies in the ice caves in the west crater and is the highest elevation lake in North America.