The goblin birthing pits are a place where goblins are born. They are located in the Goblin Kingdom.
It looks like a pit of a bubbling and steaming mud-like substance, with goblins inside, and the pit is surrounded by rock. However, the goblins are covered in the mud and look very unsettling.
- It appears the goblins can talk during this process, as one says "I'm being born".
- Goblins may be born in boiling liquid, as the substance they are covered in is bubbling and steaming
- The steam is not shown in this photo
- Gummy says the goblin birthing pits while showing Finn and Jake the "grounds", but this is the only pit seen.
- This may just be the camera angle.