Blue Cave — Neon Blue Snorkel Dive

The Blue Cave (青の洞窟, Ao no Dokutsu) is a partially submerged sea cave near Maeda Point where sunlight filtering through the underwater entrance reflects off the white sandy bottom, creating an electric blue glow that illuminates the entire cave interior. The phenomenon is most intense midday (11:00–14:00) when sunlight enters at the optimal angle.

The cave is Okinawa's most popular dive and snorkel site — accessed via a 5-minute boat ride from Maeda Port or a 15-minute swim from shore (for confident swimmers). Inside the cave, tropical fish swarm in the blue-lit water, and visibility often exceeds 20 meters.