Gau Island – Namena Marine Reserve and Lomaiviti Group

Site Overview

Gau Island is one of Fijis least-dived destinations, offering pristine walls with exceptional visibility and encounters with schooling hammerheads and manta rays in a remote setting that sees very few divers each year. The island sits in the Koro Sea within the broader Lomaiviti Group, its outer walls dropping into deep oceanic water that brings nutrients and pelagic species to the reef. The walls are remarkably pristine, reflecting the minimal human impact on this remote island and the traditional marine management practices of the local community. Scalloped hammerheads are encountered with surprising frequency, particularly from June to September, their distinctive schooling behaviour and wide head shapes creating unforgettable encounters in the clear blue water. Manta rays visit the walls seasonally, gliding along the reef face as they filter plankton from the upwelling current. Grey reef sharks are consistently present, patrolling the walls in small groups and indicating the health of the ecosystem. The coral coverage is outstanding, with gorgonian sea fans and soft corals covering the wall face in dense growth that reflects the pristine conditions. Visibility is consistently excellent, often exceeding 40 metres due to the remote oceanic location with minimal runoff and plankton. The limited dive infrastructure means that Gau Island is primarily accessed by liveaboard or by special arrangement with Savusavu-based operators. The sense of exploration and discovery at Gau Island is exceptional, with divers knowing they are among the very few people to have explored these remote walls. The island community welcomes respectful visitors and maintains the marine environment through traditional conservation practices.