Grotte marine de Keya no Oto

**Tidal access:** The cave path requires low tide. Check Japan tidal charts (tide7.com) for Keya Point. Spring tides (full/new moon) create the most dramatic cave exposure — 6-hour windows of access instead of the usual 3. **Snorkeling:** The tide pools at the cliff base hold remarkable biodiversity — spiny lobster, octopus, and nudibranchs. Bring a mask and snorkel. The water reaches 24°C in August–September. **Sunset cliff photography:** The cliff formations at the southern end of the Keya coastline create a series of silhouette compositions. The sea arch frames the sunset on clear evenings between May and July. **Combine with Itoshima beach culture:** The beach cafés (SAVA!, COVE) are excellent for post-walk food and worth visiting even without surfing.