A Cwm (pronounced coom) is a steep cirque at the top of a valley in the mountains. This one is overlooking a 5000ft drop to the unnamed 20-mile long glacier below. Where? Only in the Boundary Ranges of Alaska, of course. It is by far the most glaciated and arguably the least explored non-polar range in the world. More ice is here at 5000ft than there is in the Himalaya at 20,000ft. The view of it this evening from our high camp was unforgettable. . Photo © copyright by Marc Adamus.