An Anti-Sea-Bear Circle is a tactic used to counter a sea bear attack. It appears in the episode "The Camping Episode."
A simple circle drawn in the dirt is the only way to protect oneself from a sea bear.
Role in the series
SpongeBob and Patrick draw one to protect themselves from the Sea Bear. Squidward is attacked by a sea bear because he does everything that attracts them, but eventually goes inside SpongeBob and Patrick's circle. According to SpongeBob, it has to be an exact circle, and an oval does not work. SpongeBob and Patrick found out how to protect themselves by reading Fake Science Monthly.