← All sites

Yonaguni Monument

Yaeyama Islands, Okinawa, Japan · 5–27m · advanced · exposed

Stepped rock formation off Japan's westernmost island, whose origin is still argued over. Strong current and open to the Pacific.

Conditions today

Retrieved · refreshed hourly

poor

Poor — 1.4m effective waves made worse by local wind chop.

Limiting factor: wind

Wave height
1.1–1.8m
Wave period
8.3–10.2s
Wind chop
0.1–1m
Sea temp
30.2–30.5°C

Ranges span today's hours. Wave height here is the raw sea state — the rating scales it for how exposed the site is. Exposed — open water with nothing to block the swell, so it is scored at full height.

Next few days

  • TodayPoor — 1.4m effective waves made worse by local wind chop.poor
  • FridayPoor — 2.3m effective waves made worse by local wind chop.poor
  • SaturdayPoor — 3.2m effective waves made worse by local wind chop.poor

Each day is scored over its morning dive window, the same as today's rating.

Dive briefing

AI-generated

Conditions are poor today. Wind chop is the limiting factor, with 1.4m effective waves making the site harder work than the raw swell alone suggests. This is an advanced site in exposed water, and you'll need solid buoyancy and current awareness. Water temperature sits at 30.2–30.5°C.

Divers often log coconut crabs and yellow pond turtles here. You may also encounter scalloped hammerheads, green sea turtles, electric blue hermit crabs, common lionfish, and occasionally bottlenose dolphins. The site demands respect for the Pacific conditions, but the marine life draw tells you why people come back.

Written by Claude (claude-haiku-4-5-20251001) from the rating, forecast, and sightings on this page — it has no other source and cannot look anything up. Treat it as a summary, not as local knowledge.

Commonly seen here

Most-recorded species near this site, ranked by research-grade iNaturalist sightings from divers, snorkelers, and naturalists.

Species come from iNaturalist — research-grade sightings logged by divers, snorkelers, and naturalists nearby. The ranking reflects what people photograph most, not guaranteed abundance. Ask a local operator what's actually being seen. Species names link to iNaturalist for range maps, seasonality and more photos. Photos by iNaturalist contributors under Creative Commons licences — individual credit on hover.