Montgomery Reef

Montgomery Reef is a vast inshore reef system off the Kimberley coast in Western Australia, within Camden Sound Marine Park in the Shire of Wyndham-East Kimberley. Covering approximately 400 square kilometres, it is Australia's largest inshore reef. It is renowned for extreme tidal movements of up to 10 metres, where the reef appears to rise from the ocean at low tide with water cascading off its edges.

Visitors can expect to view the reef from a boat or expedition cruise vessel, as there is no land access. At high tide the reef is submerged, and as the tide falls the reef flat is exposed, revealing lagoons, sand cays and channels with water pouring off the reef edges forming waterfall-like cascades. Surroundings are remote open ocean and Kimberley coastline with mangroves and islands. Wildlife such as turtles, reef sharks, and seabirds may be observed. Exploration is limited to vessel-based sightseeing and photography.