Sea Platform

From Zelda Wiki.org

In The Great Sea of The Wind Waker, many Sea Platforms protrude from the water. They can be found using the Platform Chart, and are inhabited by Bokoblins and sometimes Kargaroks or a rare breed of white Wizzrobe. Sea platforms tend to be a decent source of treasure, and therefore many players enjoy the occasional Sea Platform raid, to pass the time between quests. While most platforms are scattered in clusters of one or two, one may occasionally come across a cluster of three platforms, which tend to have more valuable treasure. Some platforms will only yield their treasure if all of their mounted cannons are destroyed first. Most platforms contain treasure chests yielding a decent amount of rupees or a treasure map.