Cape Maeda, on the west coast of Onna Village on Okinawa's main island, is the island's headline snorkeling and diving base, and its sea cave — the "Blue Cave" (Aonodokutsu) — is the highlight. Sunlight entering the limestone cave reflects off the white sandy floor and makes the whole pool glow an otherworldly blue, which is why this is Okinawa Honto's most tour-dense, beginner-oriented snorkel site. The water is shallow (roughly 1–8 m) with 15–30 m visibility on good days, and over the coral you'll spot damselfish, clownfish, butterflyfish and often green sea turtles. As of 2026 it stays extremely busy in the April–November high season, and Cape Maeda requires every snorkeler to wear a life jacket or buoyancy aid.
The Blue Cave itself: sunlight bouncing off the white sandy bottom fills the limestone sea cave with a glowing blue light — best in the morning when the light penetrates most strongly.
Shallow, clear water (1–8 m deep, 15–30 m visibility) over coral, with green sea turtles, damselfish, clownfish and butterflyfish.
Two ways in: a beach entry down roughly 100 steps from the cape, or a boat entry that skips the stairs, reaches the cave more reliably, and suits kids, older visitors and anyone with limited stamina.
Okinawa's most beginner-friendly and tour-dense snorkel spot, with parking, showers and lockers on site for easy first visits.
Winter (Dec–Mar) brings humpback-whale watching season and thinner crowds; when north winds close the shore entry, operators switch to the boat point.
Good to know
SafetyThis is a rip-current and current zone where you can be pushed offshore. A woman in her 70s drowned while snorkeling here without a life jacket, and another water accident occurred in April 2026. Beginners should never enter alone and must wear a life jacket or buoyancy aid.
SafetyThe beach entry means descending roughly 100 steps to a slippery natural rock ledge. On days with any swell the entry and exit are dangerous — watch your footing on the wet reef rock.
SafetyDive and tour boats work this area. Keep clear of boats and jet skis, stay with your buddy, and mark your position with a buoy or float.
SeasonFrom June to September (peak July–August) Okinawa issues a habu (box) jellyfish advisory. Stings can cause shock and have been fatal, so cover exposed skin with a rash guard or wetsuit and carry vinegar for first aid. Note that Cape Maeda is a rocky point with no stinger nets.
SeasonThe best window is roughly April–November (especially May–October). Summer water is warm (27–29°C) with great visibility but requires typhoon checks; winter is 21–23°C with frequent north winds and swell. Free shore entry is only allowed on a blue flag (about 35% of the year); on a red flag (about 65%) the stairs are closed, so always check the day's sea conditions and flag before you go.
RulesA life jacket or buoyancy aid is mandatory at Cape Maeda. Beginners should book a proper guided tour — ideally with a "Blue Cave Expert Shop" affiliated operator who knows the tides and currents.
MannersDon't stand on or step on the coral. Keep your distance from sea turtles and other wildlife, and never touch or feed them.
Practical info
About an hour's drive from Naha Airport to Onna Village on the west coast, with parking, showers and lockers at Cape Maeda. Entry is by the stair beach entry when the flag is blue, otherwise with an instructor (yellow flag) or by boat tour; boat entry is the easier, safer choice for beginners, children and older visitors. Confirm current fees, hours, tour requirements and the day's sea-condition/flag status before booking, as these change.
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