Continental Glaciers: They are broad and extremely thick. They cover vast areas of land near the earth’s polar regions. Glaciers of this type build up at the center and slope outward to flow toward the sea in all directions. Valley glaciers: They are long, narrow bodies of ice that fill high mountain valleys. Each glacier is a stream of ice, bounded by precipitous rock walls flowing down the valley from an accumulation center near its head. Like rivers, valley glaciers can be long or short, wide or narrow, single or with branching tributaries.