Sekisei Lagoon has the largest scale of corals. A sea area designated as Iriomote-Ishigaki National Park has so clear water that coral reefs and colorful fish live together here. Once you dive into the sea, you certainly forget the time passing.
Taketomi-cho, yaeyama-gun, okinawa
Access: it's good to take part in snorkel tours from Ishigaki, Taketomi or Iriomote Island.