The Bone Fields Caves are a minor cave system accessed through holes in the ceiling of the Lost River Bone Fields.
Only three of these caves exist in the Bone Fields. Gel Sacks are occasionally seen scattered around in these caves, along with an exclusive species of Coral unofficially known as cave Coral which is only found here.
- The corals found in the Bone Fields Caves were originally planned to be used for Reefbacks. The models were later repurposed to be used in the Lost River.