Wuhu Island River
The Wuhu Island River (known as Crystal River in its debut in Wii Fit) is a small river that cuts through through the middle of Wuhu Island, and then flows into the ocean surrounding it. It has two sources. One starts at Duckling Lake, descends down Summerstone Falls, and and cuts through the center of the Island, flowing under the Footbridge and Red Iron Bridge along the way, and finally flows into the ocean. The other source follows the same route, but it comes from a cave underneath Maka Wuhu. This underground river has an unknown source, which is presumably groundwater.