A steep slope at the head of a valley like the rock cliff at the back of a cirque.
vertical ("wall") or near-vertical section of slope at the uphill end ("head") of a valley, ravine, cirque, etc.
where the face of a mountain steepens dramatically.
the steep, cliffy back-wall of a cirque. Tarn
steep cliff where the main channel of the river drives against it at a 90-degree angle.
upper section of a mountain where the terrain is set off from that below by being more steep
The point where a cliff or mountain's face steepens dramatically.
a steep cliff, usually the uppermost part of a cirque.