Montebello Islands

Montebello Islands Marine Park is a 37,560-hectare marine protected area encompassing the waters surrounding the Montebello and Barrow Island archipelagos off the Pilbara coast of Western Australia. The marine park protects some of Australia's most pristine and biologically productive tropical marine habitats, including extensive coral reefs, seagrass meadows, and open-water environments. The warm Leeuwin Current and Exmouth Plateau upwelling maintain exceptional marine productivity. The park is managed by DBCA.

The marine park's coral reef communities support exceptional fish diversity characteristic of tropical Indo-Pacific reefs. Reef fish species include humphead wrasse, bumphead parrotfish, coral trout, and numerous surgeonfish, angelfish, and butterflyfish. Whale sharks visit seasonally. Humpback whales migrate through the park. Dugongs maintain one of Australia's largest populations in the Exmouth Gulf adjacent to the park. Sea turtles — flatback, green, and loggerhead — nest on island beaches. Manta rays and whale sharks frequent the area. Australian sea lions haul out on the islands.

Extensive seagrass meadows (Halodule uninervis, Halophila ovalis, and Cymodocea rotundata) cover the shallow Exmouth Plateau. Coral reef communities support diverse coral assemblages including branching and massive Acropora, brain corals, and soft corals. Macro-algae including kelp occur in cooler upwelling zones. The seagrass meadows are among the most extensive in the Indian Ocean.

The Exmouth Plateau is a shallow continental shelf covered by Holocene and Pleistocene carbonate sediments. The Montebello Islands are remnant limestone platforms from the plateau surface. The plateau drops steeply to deep Indian Ocean water to the west. Coral reef growth has been building on the limestone platform for millions of years. The Barrow Island area is associated with oil and gas geological structures.

Arid tropical climate. The warm Leeuwin Current maintains sea temperatures around 23–28°C. Cyclones can cause significant reef damage. The tidal regime is complex with diurnal tides of 1–2 metre range. Northwest winds prevail in the wet season; southeast trade winds prevail in the dry season.

The Montebello and Barrow Island sea country is the traditional marine territory of Thalanyji people, who have used these waters for fishing, turtle hunting, and dugong harvesting for thousands of years. European pearling and fishing operations used the area from the late nineteenth century.

Montebello Islands Marine Park was established to protect the marine environment of the archipelago, providing complementary marine conservation alongside the terrestrial conservation park. The park is zoned to allow sustainable recreational fishing in general use zones while protecting sanctuary areas.

Diving and snorkelling on pristine tropical reefs — one of the best diving destinations in WA. Recreational fishing for pelagic and reef species. Whale shark encounters seasonally. Whale watching during humpback migration. Sea kayaking in sheltered bays.

Accessible by private boat from Dampier or Onslow. DBCA permits required for island access. No facilities. Remote location requires full self-sufficiency.

The proximity of Barrow Island LNG and petroleum extraction operations presents ongoing contamination risks. Cyclone damage periodically degrades reef communities. Crown-of-thorns starfish outbreaks can damage reef corals. Sea surface temperature increase from climate change threatens coral bleaching events. Maintaining the islands' predator-free status requires strict biosecurity for all vessel visits.