Meet the site
The Willis Islets are a sunken atoll roughly 45 by 19 km in the central Coral Sea with three islets. Marinelife.org.au notes that the lagoon is about 8 m deep and that Willis Island is the only inhabited island in the Coral Sea, home to a Bureau of Meteorology weather station established in 1921. The station is an important early-warning post for cyclones approaching the Queensland coast.
Diving here is incidental to expeditions and research voyages rather than a destination in itself, and no dive sites are named in the sources consulted. The shallow lagoon offers sheltered diving and snorkelling over coral and sand at around 8 m, while the outer slopes of the atoll drop into deep water and can be dived in calm weather. Visibility on the outer reef is typically excellent.
The islets are important seabird habitat, and Parks Australia's recent protection measures for Coral Sea islands mention seabird colonies, including sooty terns, brown noddies and shearwaters, on South and Bird islets. Green turtles are likely to nest on the islets as they do elsewhere in the Coral Sea. Expect the typical fauna of remote Coral Sea reefs: reef sharks, groupers, trevally, parrotfish and turtles.
Willis suits self-sufficient expedition divers. Visitors must follow the Parks Australia island access guideline and must not land on the weather-station island without permission. It is best treated as a stop on a longer expedition rather than a dive destination. Because the atoll is in the path of cyclones, trips are best planned for the calmer months of September to December.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Willis Islets is recorded as Island in Coral Sea. The listed access is boat (multi-day/liveaboard). Confirm the actual meeting point, route and permission to visit; a map pin does not establish any of these.
Historical access notes exist for this record, but have not been independently verified for current use. Request current directions from the operator or site manager rather than following an old entry description.
Questions, answered
Is Willis Islets suitable for my certification?
The record lists Advanced Open Water. That does not establish suitability for every route or day. Share your training, recent experience and equipment needs with the operator and ask about the specific proposed dive.
Can I book Willis Islets through YouDive?
YouDive is an independent research directory. Contact an operator directly to confirm whether it currently runs the trip, the inclusions and the booking terms.
What you might see
Reef sharks, groupers, trevally, parrotfish, turtles, reef fish; seabird colonies (sooty terns, brown noddies, shearwaters) on the islets
Location
A sunken atoll about 45 by 19 km with three islets, including Willis Island, the only inhabited island in the Coral Sea (a Bureau of Meteorology station since 1921), roughly 450 km east of Cairns.
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
marinelife.org.auaustralianmarineparks.gov.auRecord updated 27 Sept 2026. Source claims are being reviewed.
