Little Blue Lake is a striking volcanic sinkhole (cenote) set among Limestone Coast paddocks, offering some of the clearest freshwater snorkeling in South Australia. The circular lake measures roughly 40 metres across with sheer 8-metre cliffs plunging into brilliant blue-green water. Unlike the famous Blue Lake in nearby Mount Gambier, this smaller sinkhole is open for swimming, snorkelling and cave diving year-round. The water clarity is exceptional, allowing snorkelers to see the steep, submerged volcanic walls descend into darkness toward the lake's maximum depth of 47 metres. A staircase and floating pontoon provide safe entry and exit at the artificial cutting on the south side. The water sits at a bracing 12 °C all year, so a wetsuit is essential for extended time in the water.
Little Blue Lake
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DANGER: Explicit Risks Present
Little Blue Lake has hazards marked as danger. Entering the water here means you may face serious risks to your personal safety.
- Extreme depth danger
The lake plunges abruptly from the pontoon to over 25 metres at the shallowest point, with a maximum depth of 47 metres. Weak or inexperienced swimmers are at serious risk.
- Cliff jumping danger danger
Cliff jumping is prohibited due to submerged rocks, uneven bottom contours and the extreme depth.
The spot
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Community contribution: submitted by Daniel
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High risk: Extreme depth
The lake plunges abruptly from the pontoon to over 25 metres at the shallowest point, with a maximum depth of 47 metres. Weak or inexperienced swimmers are at serious risk.
High risk: Cliff jumping danger
Cliff jumping is prohibited due to submerged rocks, uneven bottom contours and the extreme depth.
Moderate risk: Cold water 12 °C
Water temperature remains around 12 °C year-round, carrying a risk of cold-water shock and hypothermia without adequate thermal protection.
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Getting in
Located on Mount Salt Road, Mount Schank, on the Limestone Coast of South Australia. Follow Mount Salt Road approximately 6 km south of Mount Gambier — the sinkhole is visible from the road among paddocks between the dormant volcanoes Mount Schank and Mount Gambier.
Gravel carpark adjacent to the lake with level limestone surface suitable for all vehicles.
Free entry. Cave diving requires CDAA Deep Cavern grade permit.
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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.