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Hanauma Bay 3.5 miles SW of Makapu‘u Head, is 0.3 mile wide and extends 0.5 mile inland. The waters off the entrance are very choppy during S and E winds. Across the head of the bay is a sand beach that is fringed by 150 yards of coral reefs. The bay is a nature preserve and is a popular snorkeling and scuba diving site. State regulations do not permit boats to enter the bay.