A short boat ride (about 10 minutes) from Uehara Port on Iriomote Island, Barasu Island is an uninhabited sandbar made entirely of broken coral fragments, drifting in the channel between Iriomote and Hatoma Island. Known as the 'miracle island' because typhoons constantly reshape — and sometimes nearly submerge — it, the surrounding reef is shallow enough to stand in (1–5 m) with striking 15–20 m visibility, making it one of Iriomote's most popular snorkeling spots for coral gardens, reef fish, and — with luck — sea turtles. As of July 2026, half-day and full-day boat tours still run regularly from Uehara Port, though the sandbar's visible shape varies trip to trip due to frequent storms.
A pure-white sandbar built entirely from coral rubble
Shallow, stand-up-depth reef entry suitable for beginners and kids
Coral gardens with clownfish, butterflyfish, and other reef species
Good odds of encountering sea turtles
Often paired with nearby Hatoma Island on full-day tours
Good to know
SafetyCurrents and tidal flow around Barasu are complex and shift quickly; independent swimming access is unsafe. Go only with a guided boat tour, stay within the group/buoy area, and never swim off alone.
SafetyHabu jellyfish (box jellyfish) are common in Okinawa waters from roughly May through October, peaking in July–August — right in the current season. Stings are intensely painful and can rarely cause shock; wear a wetsuit or rash guard to reduce exposed skin, and if stung, get out of the water immediately without rubbing the area.
SafetyThe island's surface and reef floor are made of sharp coral fragments — walking barefoot risks cuts and scrapes. Reef shoes or aqua socks are recommended.
RulesThis reef lies within Iriomote-Ishigaki National Park and the Sekisei Lagoon protected area: touching or standing on coral, and collecting coral pieces or shells, are prohibited.
MannersIf you encounter a sea turtle, keep a respectful distance and never touch or feed it; avoid standing on coral for photos.
SeasonBest season is March–November (peak June–September); July water temps run 26–29°C, but this overlaps with box jellyfish season, and August–October sees frequent tour cancellations due to typhoons — build flexibility into your itinerary.
Practical info
Reached only by boat (about 10 minutes) from Uehara Port on Iriomote — there is no independent land access, so book a local half-day or full-day tour (equipment usually included). Confirm current pricing, schedules, and typhoon cancellation policies directly with the operator.
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