Marovo Lagoon

Seghe · Western Province · Solomon Islands

Marovo Lagoon unfolds across the Western Province of the Solomon Islands like a jade mosaic set in sapphire. It is the largest saltwater lagoon in the world, a double-barrier reef system stretching nearly 150 kilometres along the volcanic islands of New Georgia and Vangunu. The outer barrier faces the open Pacific, its walls dropping into abyssal depths, while the inner reef shelters a labyrinth of coral gardens, seagrass beds, and mangrove-fringed islands where traditional Melanesian communities have fished these waters for millennia. I dived the outer barrier near Uepi Island on a calm June morning. The wall starts at three metres and drops vertically beyond recreational limits. The coral here exists in a state of near-primordial health. Hard corals carpet the wall in overlapping layers, every species seemingly competing to outgrow its neighbour. Enormous table corals project from the wall like balconies, and beneath each one a different assemblage of fish sheltered from the mild current. A school of humphead parrotfish, perhaps twenty strong, worked the reef crest above me, their beaked jaws audibly crunching coral and leaving clouds of white sand in their wake. At twenty-five metres a grey reef shark appeared from the blue, circled once, and stationed itself at the wall's edge. Then another. Then three more. Within a minute I counted eight sharks holding position in the current, their bodies barely moving, eyes fixed on the reef. The ease of these encounters, without bait or feed stations, is what distinguishes Marovo. The sharks are simply here because the reef sustains them. The afternoon dive was inside the lagoon over a seagrass meadow where the guide promised something special. At eight metres, hovering over turtle grass, a shape materialised that I initially mistook for a manatee. It was a dugong, grey and rotund, methodically grazing the seagrass with its downturned snout. We watched for five minutes as it fed, completely oblivious to our presence, before it surfaced to breathe and returned to its meal. Dugongs are rare in the Solomons and Marovo is one of the last reliable places in Melanesia to encounter them. Between dives, the boat idled over a shallow patch reef where a WWII Grumman Wildcat fighter lay upside down in six metres of water, its propeller bent and engine block colonised by soft coral. The Solomons are layered like that, war and reef and tradition stacked on top of each other, and Marovo holds all three in quiet balance.