A horn is the pyramidal peak of a mountain, created by several glaciers carving away at different sides of the same mountain; that is, cirques on all sides are eroding backward into the mountain mass. It’s no accident that the best horns occur on mountains that are being rapidly uplifted, where gradients are steep and erosion is fast. The Matterhorn in the Alps is the classic example, but Bloody Mountain in California and Forbidden Peak and Mount Shuksan in the Washington Cascades are also fine examples.

Robert Hass