Great Barrier Reef in 1911: Yongala lost

The world's largest coral-reef system: GBRMPA zoning, a 1981 UNESCO listing, and snorkel pontoons that sit beside wrecks like the Yongala. The Great Barrier Reef is a coral province off Queensland, managed as the Great Barrier Reef Marine Park since 1975 and inscribed by UNESCO in 1981. It is not one snorkel stop: ribbon reefs, coral cays, inshore islands and a few historic wrecks sit under the same zoning maps GBRMPA publishes.

Wow factor is at the top of this atlas. Seasonality is high because of the summer stinger (box-jellyfish) window, cyclone risk and the difference between a calm cay and a Coral Sea wall. Accessibility is middling: Cairns and the Whitsundays run day boats; outer ribbon reefs and the Yongala are longer, weather-bound trips.

This chapter is a place atlas, not a certifying agency, not medical advice, and not a live briefing. Zoning, stinger suits and the day's wind override any sentence here. Destination pages are season and access notes — not a booking engine. Pick the matching craft page (snorkel/scuba/surf) before the flight.