In the book, Tuck Everlasting, describe Treegap.

Treegap is the small town where Winnie lives and the location of the spring that changed the Tucks forever. Winnie Foster lives in a proper, middle-class house with a fenced-in yard on the edge of the town of Treegap. Her family supposedly owns the nearby Treegap wood, but nobody really owns the wood. It is an ancient, mysterious place, something, Babbitt hints, which has been left over from a previous creation. At its center, protected by magic, lies the fountain of eternal life, a tiny, nondescript spout of water at the base of an ancient ash tree.