The Bone Field Caves are a small caves system accessed through holes in the ceiling of the Lost River Bones Field.
The Bones Field Caves are mostly shrouded in darkness, poorly illuminated by flora and coral. Gel sacks are occasionally found scattered in these caves, along with an exclusive type of Coral - unofficially known as "Cave Coral" - growing here.
- The corals found in the Bones Field Caves were originally planned to be grown on Reefback Leviathans. The models were later repurposed to be used in the Lost River.