Sea Route 20
Route 20 stretches from east to west with Seafoam Islands in the middle. From east to west, water stretches the entire length of the route, while a labyrinth of rocks around Seafoam split the route in half, followed by a small rest platform just west of the Seafoam Islands (though this has become a single, large island in Generation IV), before finally reaching Cinnabar Island. Normally, the only way to cross them is by travelling through the underground caves on the islands. The northern cave can be accessed from the east and the southern cave can be accessed from the west.
