Three Rocks, Okinawa: Deep coral pinnacles in the Yaeyama region

Three Rocks, also known as Mitsuishi, is defined by its verticality rather than a continuous reef structure. The site consists of three separate coral pinnacles that emerge from a sandy bottom at approximately 35 metres and rise toward the surface, with the highest points reaching about 12 metres. This topography creates a varied environment where you can transition quickly from deep, shaded slopes to shallower, sunlit reef heads. The proximity of these three formations allows for a dynamic dive profile that moves between the structures and the sandy channels between them.

Approaching the site by boat, you will find an exposed location that is subject to the open ocean's influence. The descent typically begins along one of the slopes, where the light shifts as you move down the vertical relief of the pinnacles. As you descend towards the 35-metre mark, the terrain settles into a sandy floor that surrounds the base of the rocks. This combination of hard coral structures and soft sand makes the site an interesting study in how different species occupy specific niches within the same small area.

The current at Three Rocks is moderate but can change depending on the sea conditions offshore. You will often find that the strongest currents bring the best visibility, frequently reaching between 25 and 40 metres. Navigating the site requires awareness of how the water moves around the pinnacles, as the structures can create localized eddies or slight surges. Being comfortable with boat entries and managing your buoyancy in a moving water column is essential for a controlled experience here.

For those interested in macro photography, the crevices and sandy patches around the rock bases offer significant interest. You can find various nudibranchs and frogfish tucked into the coral formations or resting on the bottom. Scorpionfish are also common, often camouflaged against the rocky substrate or the reef edges. These smaller residents require a slower, more methodical approach to spotting, especially when moving through the more current-prone sections of the pinnacles.

The larger scale of the site is revealed when you look toward the blue or scan the upper sections of the pinnacles. Manta rays are known to visit these structures, often cruising the currents around the rock edges. The vertical relief of the pinnacles provides a natural meeting point for larger pelagic species moving through the area. Watching these animals interact with the reef structure adds a significant dimension to the dive, especially when visibility is at its peak.

The site is accessible year-round, though your experience will be dictated by the seasonal sea states and the local operators' assessment of the conditions. Because the site is situated a few kilometres from the coast, the swell and water movement are more pronounced than in sheltered bay diving. This exposure is what maintains the nutrient-rich flow that supports the resident fauna, but it also means you must be prepared for a more oceanic environment. Planning your dive around the tide and local weather reports will help you make the most of the visibility and current.