Halfway Island is a small, uninhabited sand cay perched between Great Keppel Island (Wop-pa) and Humpy Island in the Keppel Bay Islands, part of the southern Great Barrier Reef. This tiny island is surrounded by fringing coral reefs and clear turquoise waters, making it a prime snorkel and dive site. The site is known for its pelagic fish, large rays, and occasional sharks that cruise through the channels between the islands. A popular spot for boat-based day trips, picnics, and underwater exploration, it offers a classic Capricorn Coast reef experience with healthy coral bommies and excellent visibility in calm conditions.
Halfway Island dive site
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Showing last known conditions
Wave Height 0.1 mSwell Period 5.3 sWind Speed 1.4 knPrecipitation 0.0 mmTidal Phase flood
Last evaluated
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Community contribution: submitted by Daniel
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Moderate risk: Tidal channel currents
Tidal currents can be strong in the channel between Great Keppel Island and Humpy Island, especially around changing tides. Best dived at slack high tide.
Moderate risk: Marine stingers (box jellyfish)
Marine stingers (box jellyfish) are present in these waters during the warmer months (October to May).
Low risk: Wind exposure
Strong winds (particularly from the north and east) can degrade visibility and create choppy conditions, limiting access to the site.
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Getting in
Boat
Entry
Halfway Island is located between Great Keppel Island (Wop-pa) and Humpy Island in the Keppel Bay Islands, off the Capricorn Coast in Queensland. Access is by private boat or via a snorkel/dive tour with operators such as Keppel Dive, departing from Rosslyn Bay Marina or Great Keppel Island.
Parking & facilities
Parking is available at Rosslyn Bay Marina for boat ramp and tour operators. On Great Keppel Island, limited parking is near the ferry terminal area. The marina car park can fill up during peak season.
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No entry fee for the island itself. Snorkel/dive tours range from approximately $90-$150 AUD per person.
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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.
Weather & swell ┬╖ Open-Meteo marine & weather APIs Tides ┬╖ UTide harmonic analysis Sea & safety ┬╖ community reports