Lady Elliot Island house reef
Southern GBR, AU · 1-8 m · often 10-25 m · May-Nov popular
A coral cay with a research-station culture, a lighthouse, and a genuine house-reef snorkel at the Reef southern end.
Darker cells mean a higher score for this topic on that metric.
Accessibility48
Skill ceiling50
Gear load56
Risk46
Seasonality64
Wow factor96
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Quick answers
Which local rescue or training agency should I check first?
Use the local lens: coastguard/federation norms and the shop briefing for that bay — not a blog visibility claim.
What is stinger season?
A Queensland coastal window, often November to May, when box jellyfish and Irukandji risk rises. Many beaches fly stinger nets; reef pontoons issue full-body lycra. This is not a medical protocol.
Is the Yongala on the Reef?
SS Yongala sank in 1911 off Cape Bowling Green and is dived as a protected historic wreck in GBR waters, typically as an exterior. See wreck-diving.
Ribbon Reefs vs pontoons?
Ribbon Reefs (including Cod Hole) are outer-shelf walls, usually liveaboard or long day boats. Pontoons at Agincourt, Hardy and similar sites are the mass snorkel product.
Can people walk on coral cays?
Cays are nesting and research sites. Stay on marked paths. Lady Elliot and Heron run tight visitor rules.
Is bleaching the whole story?
Heat stress is the background emergency. Zoning, anchors and trampling are the visitor-scale layer. See reef-etiquette.
These are famous, mapped sites. Visibility and wind change; operators publish the day sheet. Depths are typical published bands, not a live plan.
A cay house reef is the correct first GBR water.
Points
Heron Island shallows
Capricornia, AU · 1-6 m · often 10-20 m · year-round, stinger season
A research and resort cay; etiquette is also science logistics. Walking the cay is a bird-and-turtle problem.
Ribbon Reefs / Cod Hole
Far North Queensland · 8-25 m · often 15-25 m · dry season liveaboards
Outer-shelf walls and the famous potato-cod site. Usually a liveaboard, not a first pontoon day.
SS Yongala
off Cape Bowling Green, AU · 16-30 m · often 10-20 m · Jun-Oct popular
Sank 1911; a protected historic wreck with dense fish. Typically an exterior. See wreck-diving.
Agincourt Reef pontoons
Port Douglas shelf, AU · 2-15 m · variable · year-round, weather
The mass outer-reef day product: platforms, helmet dives, and a concentrated impact that parks try to manage.
Hardy Reef / Heart Reef look
Whitsundays, AU · 2-12 m · variable · dry season
A Whitsunday outer-reef pontoon area; Heart Reef itself is a overflight icon, not a walk-in snorkel.
Michaelmas Cay
off Cairns, AU · 1-5 m · variable · dry season
A bird sanctuary cay with a roped snorkel; the cay is closed to wandering. Terns are the residents.
Osprey Reef (Coral Sea)
Coral Sea, AU · 10-40 m · often 20-40 m · liveaboard windows
A Coral Sea atoll often sold beside GBR trips: walls, sharks, and a longer crossing. Not the same park as the inner reef.
Tips
- Cay or pontoon first — Ribbons and the Yongala wait.
- Ask about stinger and wind — The two calendars that cancel days.
- Pay the Marine Parks charge — Rangers and zoning are the product.
- Osprey is Coral Sea — A different crossing, a different plan.
The GBR is a province of cays, pontoons and a few sharp wrecks. One name is not one site.