Step onto a tidal sandbar that appears only at low tide and snorkel the coral-rich Sekisei Lagoon on a guided two-hour trip from Ishigaki. This eco-minded tour includes gear, photo data, and hot showers back at port.
More ways to explore the area's outdoor wonders
A low, shifting sandbar rises from the blue—then vanishes. From the boat the island looks unreal: a pale crescent of sand encircled by clear water, a 360-degree horizon with only sky and reef. Guides brief the group while the wind tests your resolve and the sea dares you to step in.
Difficulty
easy
Duration
2 hours
Fitness Level
Suitable for most people comfortable in the ocean; basic swimming/snorkeling stamina for short swims required
Wildlife
History
Sekisei Lagoon is the largest coral reef area in Japan and lies within Iriomote-Ishigaki National Park; local Ryukyuan communities have long harvested lagoon resources with traditional techniques.
Conservation
The reef is fragile—tours operate with eco-guidelines and guests are urged not to touch coral, use reef-safe sunscreen, and follow guide instructions to minimize impact.
Reserve your spot on the Okinawa Ishigaki Phantom Island Snorkeling Tour today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Bring reef-safe sunscreen
Use only reef-safe sunscreen to protect coral; apply before boarding and reapply after exits.
Wear reef shoes
Stony shallows and coral fragments make reef shoes useful for entry and on the sandbar.
Check tide timing
The sandbar is best exposed at low tide—morning departures usually offer calmer conditions and the island at its largest.
Observe, don’t touch
Do not touch coral or handle marine life; guides will enforce no-touch rules to protect the reef.
Reef-safe sunscreen
Protects skin and the coral—apply before boarding.
Reef shoes
Protects feet on rocky shallows and sandbar edges.
Rash guard or UV top
Light protection from sun and minor scrapes while snorkeling.
summer
Lightweight wetsuit
Helps in cooler months when surface temperatures dip.
winter