ridgeline; mountain ridge line
Refers to the continuous line formed by the highest points along a mountain ridge. Common in geography, hiking, and mountaineering contexts.
Walking along the ridgeline, you can see the scenery on both sides at once.
After checking the ridgeline on the map, we decided on the climbing route.
Compound of 稜 (ridge, edge) and 線 (line). The reading りょう for 稜 is the standard on'yomi.