Forgotten Island is the final island of the Second Sea, serving as a late-game area for players nearing the transition to the Third Sea. Its isolated location and high-level enemies make it one of the last major progression zones before endgame content.

The island is relatively large, consisting of a main cliffside landmass with several houses built on top and a sizable beach below. One of its most recognizable features is the massive skull positioned in front of the cliff, giving the area a distinctive and intimidating appearance.

Behind the main island is a smaller secondary island where the Tide Keeper spawns, making the area important for players farming boss-related rewards and progression.

Forgotten Island is located between Snow Mountain and Hot and Cold in the Second Sea. Its remote placement reinforces its role as one of the final destinations before moving on to harder content.