The Molesville Lagoon is a body of water located in Molesville. The lagoon has incredibly unique chemical properties that gives all non-animal species that are native to that jungle the ability to move about by themselves. Maximus Mole called the waters of this lagoon; "walk water," since it allowed plants to walk.
Max also used the water in this lagoon to fill up a bottle he had, and use it on an oak tree in the yard of his home in Cave County, giving it the ability to walk and also do manual labor. He even used the water of the lagoon on a rock, which actually gave it life.