Finally , around the summit of South Sister , in a clockwise direction , are the Prouty , Lewis , Clark , Lost Creek , and Eugene Glaciers .
The Irving , Carver and Skinner Glaciers lie between Middle Sister and South Sister .
Around the summit of South Sister , in a clockwise direction , are the Prouty , Lewis , Clark , Lost Creek , and Eugene Glaciers .
The Irving , Carver and Skinner Glaciers lie between Middle Sister and South Sister .