Hanauma Bay Nature Preserve is a protected marine area located on the southeastern coast of Oahu, Hawaii. It is known for its stunning coral reefs and diverse marine life, making it a popular destination for snorkeling and swimming. The bay was formed within a volcanic crater and is home to over 400 species of fish and various coral formations. Visitors to Hanauma Bay can enjoy educational programs about marine conservation and the importance of preserving this unique ecosystem. The preserve is open to the public, but there are limits on the number of visitors to help protect the environment and ensure a sustainable experience for future generations.