Admiralty (also known as Opal Reef) is a stunning crescent-shaped outer Great Barrier Reef system about 55 km northeast of Port Douglas, Queensland. Spanning roughly 9 km², this low-impact tourism zone boasts over 15 named snorkel sites including Bashful Bommie, Rayban, Mojo, and Blue Lagoon. The reef's sheltered lagoon side and protected eastern flank offer calm, clear waters (12-18m visibility) with exceptional coral coverage — branching corals, plate corals, giant boulder corals and vibrant giant clams. Snorkelers drift through shallow coral gardens teeming with clownfish, parrotfish, butterflyfish, green sea turtles, and white-tipped reef sharks. The site is accessible only via guided day tours from Port Douglas, making it a pristine, low-impact gem of the Great Barrier Reef.
Admiralty (Opal Reef)
Fair. Experienced snorkellers only.
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Moderate risk: Strong tidal currents
Certain sites (Plato, Blue Lagoon) are current-prone and can only be safely visited on specific tides. Strong tidal flows can sweep snorkelers away from mooring points.
Low risk: Wind chop / rough surface conditions
Some sites (e.g., SNO, Plato) are exposed to prevailing winds and can develop choppy surface conditions, making snorkeling uncomfortable or unsafe in windy weather.
Low risk: Marine stingers (box jellyfish / Irukandji)
Marine stingers (box jellyfish, Irukandji) are present in the waters of the Great Barrier Reef, particularly during the warmer months (November to May).
Low risk: Crown-of-thorns starfish
Crown-of-thorns starfish outbreaks have historically damaged coral at Opal Reef, though recovery has been strong. Snorkelers should avoid contact with these starfish.
Low risk: Tidal current in channel
Opal Reef is subject to tidal flows, especially near channel edges where Sandbox is located. Currents can pick up during changing tides, making it harder to swim against the flow.
Low risk: Wind and chop
The reef lies in the Coral Sea and can experience strong winds, particularly from June to August, creating choppy surface conditions.
Low risk: Marine stingers (jellyfish)
Marine stingers (box jellyfish) are present in Great Barrier Reef waters, especially during the warmer months (November to May).
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Getting in
Opal Reef is located approximately 45 km offshore from Cow Bay (Daintree), 55 km NE of Port Douglas. Tours depart from Port Douglas' Crystalbrook Superyacht Marina (check-in ~8:00 AM, return ~4:30 PM). The crossing takes about 90 minutes each way.
Paid parking available at Port Douglas Marina precinct. No direct shore access to the reef itself.
Snorkel tours range from approximately $318-$329 AUD per person (e.g., Wavelength Reef Cruises, Calypso Reef Cruises). Includes equipment, lunch, and guided snorkeling at 3 sites.
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About this data
- Conditions last evaluated
- Spot data last updated
- Data sources
- Open-Meteo (marine & weather conditions), tide predictions via UTide, community contributors (descriptions, hazards, marine life).
- License
- Spot content licensed under CC BY-SA 4.0. How's the Spot is open source.