Bear Lake

Bear Lake is a lake in Southwest Elwood City. It has a beach and it is sourrounded by mountains. There are usually a lot of people on it, and dogs are allowed on the beach because in the episode "D.W. All Wet" there was a dog on a leash on the beach of the lake. D.W. was afraid to go in it because she thought that there would be octopuses. Arthur and Buster were teasing her with it acting like Buster's bathing cap was an octopus. It's first appearence was in "D.W. All Wet"

Arthur, Buster, and Arthur's Mom entering Bear Lake

Real life inspiration

It is a rather common name for a lake. There are several Lakes with the name "Bear" You can see them here.