The observatory was originally constructed in 1970, making it one of the longest-standing underwater viewing facilities in Okinawa.
The facility is built directly into the seabed, utilizing a sturdy steel pillar to withstand strong currents and typhoons.
Unlike a traditional zoo, the marine life observed is entirely natural; the observatory features no tanks or enclosures.
The 24 circular windows are positioned at varying depths to allow for different perspectives of the coral reef ecosystem.
The whale-shaped glass-bottom boats used at the park are specifically designed to provide a wide-angle view of the seafloor through the vessel's hull.
The water depth around the observatory fluctuates with the tide, often changing the variety of fish visible throughout the day.
The surrounding area is part of a designated marine park zone where fishing and collection of marine organisms are prohibited.
The Busena Marine Park Underwater Observatory is a stationary tower located 170 meters offshore in Nago, Okinawa, providing views of the East China Sea via 24 glass windows. Visitors descend a spiral staircase to reach the underwater floor, which sits approximately 4 to 5 meters below the water's surface. The facility operates as a fixed observatory rather than an aquarium, meaning the marine life viewed is wild and untethered. In addition to the tower, the park offers glass-bottom boat tours that depart from a nearby pier to navigate the surrounding coral reefs. The site is situated within the protected coastal area of the Busena Resort, connected to the shore by a pedestrian bridge. The observatory structure remains static, allowing for stable underwater viewing regardless of sea surface conditions. It provides a dry, climate-controlled environment to observe tropical fish such as clownfish and butterflyfish in their natural habitat. The surrounding waters are known for high water clarity, which is essential for the visibility provided by the underwater windows.
The end of the pier looking back toward the shore captures the contrast between the green coastline and the turquoise water.
Check the tide charts before visiting, as high tide provides the best visibility and a higher concentration of fish.
Wear slip-resistant shoes, as the pier and bridge can become slippery when wet.
If prone to motion sickness, prioritize the observatory tower over the glass-bottom boat tours.
Do not expect to see large sharks or rays, as the observatory is situated in a shallow reef area mainly home to smaller tropical fish.
Operations are subject to suspension during inclement weather, specifically strong winds or high waves; no regular weekly closure days.
Avoid tapping on the glass windows to prevent scaring away the fish; maintain a quiet demeanor inside the observatory.
