Nakanoshima Beach — known locally by the Miyako-dialect name 'Kayaffa' — is a natural, cove-shaped snorkeling beach on the southwest coast of Shimojishima, in the Miyako Islands of Okinawa. Because the bay isn't directly exposed to the open sea, the water is often calm, and just a few meters offshore you'll find a reef of table, branching and brain corals alive with clownfish and other colorful tropical fish, earning it the nickname 'natural aquarium.' The gentle shallows run about 1–7 m near shore with excellent clarity (on clear days you can see the seabed at 10 m), making it friendly for first-time snorkelers. As of 2026 it remains an undeveloped spot with no toilets, showers or shops — a quiet, rental-car-access site that stays popular for its untouched reef.
Highlights
A natural coral garden starting just off the beach — table, branching and brain corals
Schools of clownfish and butterflyfish, with the occasional sea turtle if you're lucky
Gentle beach entry inside the sheltered cove — wade in and ease from the shallows
High visibility (roughly 20–30 m) and calm surface; clearest in the 8–10 a.m. window
Easy to pair with nearby Shimojishima sights such as Toriike Pond for a full-day loop
Good to know
SafetyThe inner cove is calm, but its boundary with the open ocean is unclear. Snorkelers absorbed in the fish can drift out to sea, where currents are strong and it's hard to swim back alone. Use a buoy/float and never snorkel solo.
SafetyRip currents occur here and strengthen especially before and after typhoons. Skip the water on windy or wavy days, and stay within easy swimming distance of shore. In 2021 a visitor snorkeling alone near this beach drowned — a real warning, not a formality.
SafetyThere are no lifeguards; this is a swim-at-your-own-risk site. The bottom is rough with sharp rock and coral, so marine shoes and gloves are essential — avoid bare-hand or bare-foot contact to prevent sea-urchin stings and coral cuts.
SeasonThe swim season runs roughly April–October; water is about 28–29°C in summer and around 23°C in winter. June–September is habu jellyfish (dangerously venomous) season, and this beach has no stinger net — wear a rash guard or dive skin to cover exposed skin.
MannersNever stand on or step on the coral, and don't kick the reef with your fins. If you meet a sea turtle, keep your distance and do not touch or feed it.
RulesDo not touch or collect coral or marine life, and use reef-safe (oxybenzone-free) sunscreen. There are no bins on site, so pack out all your trash.
Practical info
From central Miyakojima, drive about 25–30 minutes across the Irabu Bridge; the beach sits near Shimojishima Airport. Free parking holds only 10–15 cars and fills up in peak season. There is no gear rental on site, so borrow your mask, fins and marine shoes in town beforehand and bring drinking water. There are no toilets or showers (the nearest toilet is at Toriike Pond, about 2 km away). Fees and operating conditions change, so confirm the latest details before you go.
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