Diamond Beach in Onna Village, located on Okinawa's western coast, takes its name from the sparkling quality of its crystal-clear waters that shimmer like gemstones under the subtropical sun. This 250-meter stretch of white coral sand beach sits within the Onna Marine Park area, a region that became protected in the 1970s to preserve its exceptional coral reef ecosystems. The beach gained prominence as Okinawa transitioned from its post-war period into a major tourist destination, with development accelerating after Okinawa's reversion to Japan in 1972.
The beach holds natural significance as part of the larger Onna coastline ecosystem, which supports over 200 species of coral and countless tropical fish species. The surrounding waters are part of the Kuroshio Current system, which maintains warm temperatures year-round and contributes to the area's remarkable marine biodiversity. The coral reefs here represent some of the healthiest remaining reef systems in Okinawa, making the location valuable both ecologically and for marine research.
Visitors come primarily for snorkeling and swimming in the protected bay, where visibility often exceeds 20 meters and the shallow reef lies just meters from shore. The calm waters make it particularly suitable for families and beginners. Glass-bottom boat tours operate from the beach, offering views of the underwater landscape without getting wet. The beach also serves as a launching point for diving excursions to deeper reef sites offshore. Small beach facilities provide equipment rentals, including snorkeling gear, beach chairs, and umbrellas.
Diamond Beach is accessible via Route 58, Okinawa's main coastal highway, approximately 60 kilometers north of Naha Airport. The drive takes roughly 80 minutes by rental car, which remains the most practical transport option. Limited bus service operates along Route 58, with the nearest stop requiring a short walk to the beach. Parking facilities accommodate approximately 100 vehicles with fees typically around ¥500. Beach admission is free, though equipment rentals and activity fees apply separately. The beach sits adjacent to several resort hotels, making it easily accessible for guests staying in the Onna area.
