ridgeline (noun)

1. During the American Revolutionary War, General George Washington strategically used the ridgeline of the Appalachian Mountains to his advantage.

2. In J.R.R. Tolkien's novel 'The Hobbit,' Bilbo Baggins and his companions journeyed across the ridgeline of the Misty Mountains.

3. As the sun began to set, a group of friends decided to hike along the isolated ridgeline, unaware of the terrifying secrets that awaited them.

4. In the futuristic world of 'Blade Runner,' the towering skyscrapers formed a ridgeline that blocked out the sun, creating a dystopian atmosphere.