Japan
Kerama Islands
Water so transparent that sea turtles cast shadows on white sand ten metres below.
The water is the point. The Kerama Islands lie 30 kilometres west of Okinawa in water so transparent it was given its own name — Kerama Blue. Visibility here routinely exceeds 50 metres, and the coral reefs beneath are dense enough to snorkel without a boat, deep enough to dive for a lifetime.
The Kerama archipelago was designated Japan's 31st national park in 2014, protecting 22 islands and their surrounding reef systems. Humpback whales calve in the warm channels between the islands from January to March, and green sea turtles are encountered so frequently while snorkelling that their presence is considered unremarkable by locals. The largest inhabited islands — Tokashiki, Zamami, and Aka — are connected to Naha by high-speed ferry in under an hour. Despite their proximity to Okinawa's main island, the Keramas remain undeveloped by resort standards, with accommodation limited to small guesthouses and minshuku.
Couple
Snorkelling with sea turtles in the morning, whale watching in the afternoon, and a quiet guesthouse dinner at night — the Keramas offer intimacy on a reef.
Friends
Diving the outer walls, kayaking between islands, and the ferry-hopping logistics give groups a shared adventure framework.
Family
The shallow reef flats are safe for children to snorkel, sea turtles surface within touching distance, and the islands are small enough to feel contained.
- Water transparency rated among the world's highest — you can see the seabed clearly at 50 metres depth.
- Humpback whales calve in the warm channels between islands from January to March.
- Sea turtles surface beside snorkellers at beaches reachable by a 15-minute walk from the ferry port.
- No high-rise hotels — just low-slung guesthouses on islands where the loudest sound is the surf.
Mozuku seaweed in vinegar sauce — slimy, briny, oddly addictive.
Freshly speared lobster grilled on the beach by dive instructors.
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