A Buoy is a Structure introduced in Shipwrecked DLC. It requires an Empty Bottle, 4 Bamboo and 2 Bioluminescence to craft and a Science Machine to prototype. It can be placed on the Ocean in order to mark a location or to provide light. When placed, it provides as much light as a Torch, and does not require refueling. Buoys have visible Map icons, and a bell ringing softly can be heard when the player is nearby.
- Buoys were introduced in the Wilbur Vs. The Volcano update.