Outcast Island (Japanese: はずれのしまOutcast Island) is a small water route on Six Island in the Sevii Islands named after the island that lies at its northern terminus, the farthest of the small islets from the main Six Island.
The route begins as water, heading north from the very end of the Green Path. The route passes a single Swimmer, then a brother and sister team as it begins to get rocky. After it passes another Swimmer, the small island itself can be seen. Making landfall on the western side of it allows players to enter the Altering Cave.