This dive site, Ogan, is centered around an uninhabited island located approximately 15 kilometers southwest of Iriomote Island, Japan, accessible via an hour-long boat journey. It is characterized by dynamic underwater topography, including the notable 'Eastern Root,' a massive formation ascending from 40 meters depth. Renowned as an advanced diving location, Ogan often presents fast and challenging currents that require experienced navigation.
The marine environment at Ogan is exceptionally rich in pelagic life. Divers frequently encounter large schools of blue tuna, red snapper, hawks, bluefish, yellowtail, bluefin tuna, and bluefin trevally. Other significant sightings include Napoleon fish, blackfin barracuda, and, on occasion, whale sharks, making it a prime location for big-fish encounters.
While specific best times are not detailed, the highlights of Ogan are undoubtedly the thrilling interactions with large marine species and the dramatic underwater landscape. Due to the strong, fast currents, this site is recommended exclusively for advanced divers. The conditions also make it generally unsuitable for casual snorkeling, though it can be an attractive, challenging spot for experienced freedivers targeting pelagic species.
