Yonaguni

The strongest planning case is December through April, supported by active local dive operators, while November and May may be shoulder months in other operator accounts. Most divers search the open-water Irizaki/Cape Irizaki area on guided drifts. Sightings are unpredictable, including on peak-season days, and the ocean can be rough in the northeast winter monsoon. Yonaguni Diving Service imposes special logged-dive and recent-activity requirements from December 20 through March 31. Book with an operator that accepts your exact experience and keep a spare day for weather. Season source; operator terms.

Some local operators publish introductory dives, beginner instruction or calmer guided routes, particularly outside the winter pelagic rush. That does not make the signature hammerhead drift at Irizaki an introductory dive. The official Okinawa tourism board warns that most sites are exposed and best approached by experienced divers. Yonaguni Diving Service, for example, requires 50 logged dives and recent activity for its December 20 through March 31 high-season dives. If newly certified, request a precise sheltered route, instructor ratio, depth and current plan before reserving anything. Trial dive listing; Official difficulty.

No. The Irizaki open-water drift is a wildlife search, not an aquarium or feeding station. A local operator explicitly says that the site can deliver no noteworthy sightings at all. Current direction, visibility, diving skill and skipper routing change the result. Sharks can be seen in winter, but neither a published season nor reports of large schools establish a sighting probability for your trip. Never split from the guided group, chase sharks or descend deeper to try to force a photograph. Ask guides how they handle separation and buoy deployment. Irizaki site notes; Dive protocol.

The Yonaguni Monument is a large terraced underwater rock formation offshore of the island's southern shoreline. Its straight-looking edges have generated competing explanations, but a human-built prehistoric city is not established fact. Local operators describe guided scuba at the site, and Sou-Wes markets separate snorkel and semi-submersible viewing options. Strong currents and south or east winds can prevent reaching the formation even during an island stay. A glass-bottom outing may replace it with a north-coast scenic route. Confirm the exact activity, its access conditions and whether it will go ahead that day. Dive operator; Viewing vessel.

Yonaguni Airport (OGN) receives JAL Group/Ryukyu Air Commuter domestic service from Ishigaki and Naha, with date-specific flight times and seat availability. The alternative is Fukuyama Kaiun's ferry between Ishigaki and Kubura Port. Its current schedule lists Ishigaki departures on Monday and Thursday at 10:00 and Yonaguni departures on Tuesday and Friday at 09:00, about four hours each way. Older tourism PDFs show a different pattern and should not be used. The ferry sells foot-passenger tickets for cash on sailing day and may cancel for seas or an annual summer docking period. Current official ferry timetable; Airline timetables. Ferry update checked November 4, 2026: the operator currently warns of arrivals about 40 minutes later than the normal four-hour crossing, approximately 14:40 at Yonaguni and 13:40 at Ishigaki; departure times are unchanged and the recovery date is unannounced. Its November event schedule also moves sailings to Ishigaki outbound November 13 and Yonaguni return November 15, with surrounding dates changed. Check the actual dated calendar rather than applying the normal weekdays to every November trip. Current operator arrival and November schedule notice.

Do not plan Yonaguni as a self-guided shore-diving island. Yonaguni Diving Service explicitly describes its usual diving as boat-only drift diving, with guide-led mid-water descent and open-water pickup. A point named Dannu Beach on a dive map does not mean the adjacent beach is a suitable entry. The island's beaches are unpatrolled and often exposed to dangerous rip currents, with specific coves closed to swimming. Work with a local dive shop to check actual permitted operations and conditions. Bring an SMB and demonstrate competent boat and current procedures before trying the harder offshore sites. Local dive model; Town warning.

Sou-Wes lists a guided snorkeling experience at the underwater Monument, but its day-to-day availability and suitability need direct confirmation. There is no verified island beach that should be promoted as an unconditionally safe, patrolled snorkeling area. The Yonaguni Town Tourism Association says beaches have no lifeguards or jellyfish nets; Rokujo Beach and Ubudumai are specifically prohibited for swimming. Nama Beach is near a vessel channel. Choose a supervised outing with buoyancy equipment, assess weather and do not snorkel alone, especially around reef edges and narrow coastal exits. Operator offer; Local ban; Beach record.

A current, regularly bookable Yonaguni-based freediving school, instructor-led depth session or safety-backed breath-hold charter was not verified during this research. That is a supply gap rather than a claim that nobody ever freedives in the area. Local scuba operators and a video of a past celebrity freedive do not establish an approved freediving program. Before making it your reason for visiting, secure direct written confirmation of dedicated freedive safety staff, rescue ability, suitable conditions, site approval and the exact activity. Independent depth work in strong currents or from unguarded shores should not be assumed feasible. Local safety; Local operator context.

For a dive-focused trip, a practical starting plan is three to five nights, leaving at least two intended boat days, one weather contingency and a final nondiving period before flying. This is a planning recommendation, not an operator package or guarantee of departures. Winter pelagic sites may be cancelled for wind even when views on land are excellent. You can use the land days for Irizaki, Agarizaki, a horse activity, natural-dye workshop or museum. Book lodging and transport early; the ferry is infrequent and storms can disrupt both aircraft and boats. Ferry constraints; DAN flight planning.

The best-supported alternatives are a supervised Chimanma Hiroba Yonaguni-horse experience, coastal lookout visits at Irizaki and Agarizaki, a Tokumi Kobo natural-dye or weaving workshop, and the Ayamihabiru giant-moth museum. Sou-Wes also runs a semi-submersible underwater-view boat, but the route can change and the trip may cancel due to sea conditions or a minimum passenger requirement. Treat beaches as scenic stops first, not safe swimming areas. The island tourism association also lists dangerous cliff paths and unstable buildings: follow present-day access restrictions rather than old hiking blogs. Horse; Craft; Closures.

Yonaguni Town Clinic publishes routine weekday appointment hours and says emergency illness or injury outside opening hours should be reported to 119. For a marine rescue contact the Japan Coast Guard on 118, and for police emergencies use 110. An on-island recompression chamber was not verified, so divers must not rely on immediate hyperbaric care or a predictable evacuation time. Discuss emergency oxygen, boat communication, insurance and transfer plans with the operator in advance. Never fly with suspected decompression illness; seek immediate medical assessment. Clinic; Okinawa emergency guide.

The reviewed official tourism sources and direct local operator pages did not identify a mandatory Yonaguni-specific visitor marine-park tag or blanket diving permit. This is not a legal ruling and does not remove the need to follow a skipper's site permissions, local fishing/collecting restrictions or future rules. The usual known expenses are commercial guided boats and rental equipment, your travel ticket, lodging and any optional museums or activities. The submerged Monument is not an invitation to collect objects. Reconfirm fees and access rules with your chosen operator before the trip. Dive provider; Prefectural restrictions.

Divers Alert Network recommends minimum preflight intervals of 12 hours after one no-decompression dive, 18 hours after repetitive or multiday no-decompression diving, and at least 24 hours after dives requiring decompression, with longer intervals prudent. These limits do not eliminate decompression risk. Some Yonaguni dive providers prohibit flight on the same day as a dive. Because airport departures and emergency care are limited, a full nondiving final day is a sensible additional buffer for many visitors. Any suspected decompression symptoms require prompt medical advice, not a return flight. DAN; Operator advice.

Yes, local operators describe year-round guided scuba with a seasonal change in emphasis. Their May-to-November offerings include rock arches, wall-style topography, bright sand, tropical reef fish and smaller life at sites such as Sabachi, Dannu Beach, Umahana W Arch and White World. But current strength varies by point, and warm weather does not guarantee the same coast is accessible: southern winds can block the Monument. Ask for a calm-weather route compatible with your certification rather than forcing a winter shark objective into a summer itinerary. Typhoons may interrupt late-summer travel and dives. Summer operator; Site descriptions.