Calm Belt

The Clam Belts are the areas just north and south of the Grand Line. These areas almost never have ocean currents or winds blowing, and are also nesting grounds for Sea Kings. They are very effective barriers for those trying to enter the Grand Line. The same group of Sea Kings catching the Strawhat Pirates on top of one of their heads again (they got away with the same method as last time, pulling the nose hair on the largest one to make it sneeze them away) which implies that they don't stay in the calm belt consistently.

However it was revealed that the Marines crossed the Clam Belt by using the Seastone lining at the bottom of the ship where a Sea King won't notice a ship above them.

Very few islands are found within the Clam Belt zone. However, the island of Amazon Lily is one of the few which is known to be there, with it's isolation and it's protection by Sea Kings used to protect them from intruders as well as prevent anyone outside their own to pass within the island.

First Appearance: Chapter 101; Episode 54