The Lake

The Lake is a large body of water in Forest Survivors, and the northernmost landmark throughout the entire movie.

Plot
Before the events of Forest Survivors, the Knife of Ages was hidden at the Lake for protection. The key was not with it, but somehow ended up in the hands of Squire Flanagan.

During the movie, Dorian Moe leads Joshua Wilder to the Lake to show him the Knife of Ages. He only then realizes the box is locked, and doesn't have the key.

Trivia
During the movie, the scene was filmed at Lake Ontario in New York.