Rowley Shoals

Broome · Western Australia · Australia

The Rowley Shoals are three coral atolls rising from the deep Indian Ocean roughly 300 kilometres west of Broome in Western Australia, and they are among the most pristine reef systems left on Earth. Mermaid Reef, Clerke Reef, and Imperieuse Reef sit in a line running north to south, each one an oval-shaped atoll with a shallow lagoon, a reef flat, and sheer outer walls that drop from the surface into water over 400 metres deep. The remoteness is extreme, the access window is narrow, and the number of divers who visit each year is counted in the hundreds rather than thousands. The result is coral reef diving in a condition that most divers have never seen and may never see again. The outer walls of the atolls are where the Rowley Shoals earn their reputation. Dropping vertically from just a few metres below the surface, the walls are coated in hard coral coverage so dense and healthy that they look like textbook illustrations of what a reef should be. Over 200 coral species have been recorded, and the diversity creates a three-dimensional architecture of staghorn thickets, plate corals stacked like shelves, massive Porites bommies, and delicate branching corals that sway in the gentle oceanic swell. Visibility regularly exceeds 50 metres, meaning you can see the wall stretching below you into the deep blue with an almost vertiginous clarity. The tidal channel dives are the adrenaline component. Water floods in and out of the atoll lagoons through narrow breaks in the reef, and during tidal changes the current through these channels can exceed three knots. Diving the channels means dropping in upstream and riding the flow through the gap, with grey reef sharks, silvertip sharks, and enormous potato cod lining the walls and facing into the current alongside you. Giant trevally smash into baitfish with explosive force. Napoleon wrasses cruise past with their humped foreheads and inscrutable expressions. The channel spits you out into the lagoon or the open ocean depending on tidal direction, and the sensation of controlled speed through crystal water flanked by pristine coral walls is unlike anything else in diving. Inside the lagoons, the pace shifts. Shallow coral gardens in protected water host green and hawksbill turtles, giant clams in electric blues and greens, and clouds of damselfish and anthias that hover above the reef in shimmering curtains. Bumphead parrotfish roam in schools, their heavy bodies crunching coral with audible force. Manta rays occasionally visit the shallows to be cleaned. The contrast between the wild outer walls and the serene lagoon gardens gives each day of a Rowley Shoals liveaboard trip its own character. The Rowley Shoals demand commitment: a long crossing from Broome, a short season from September to November, and conditions that require genuine diving experience. But for those willing and able to make the trip, the reward is reef diving in a state of health and beauty that has all but vanished from most of the world's oceans. This is what a coral reef looks like when humans stay away, and seeing it firsthand changes your frame of reference for every reef you dive thereafter.