The Chipmunk Cave first appears in "Bun Bun," and is where the Flame King hides in after escaping the Fire Kingdom. In the cave, he was planning an invasion to usurp Flame Princess with his army of Chipmunk and rule the Fire Kingdom. After Bun Bun noted that his plan would fail, he decided to settle down in the cave and take the role of the Chipmunk King.
The cave is fairly circular inside with a few large rocks. This cave doesn't appear to have any stalactites or stalagmites, which differs it from other caves.