Little Blue Lake: Depth, Temperature, Walk & Camping

There are swimming holes, and then there are swimming holes that make you grateful you packed a rashie. Tucked into a paddock near Mount Schank in South Australia’s Limestone Coast, Little Blue Lake is a cold, deep sinkhole that stays around 12–16°C every day of the year. This guide walks through its formation, temperature quirks, access rules, and what you actually need to know before you visit.

Depth: 47 m (max) ·
Water temperature: 12–16°C year-round ·
Location: Mount Schank, South Australia ·
Type: Sinkhole (cenote) ·
Distance from Mount Gambier: 15-minute drive ·
Access: Stairs and floating pontoon

The table below provides a quick reference of key specifications.

What is the Little Blue Lake?

Little Blue Lake is a water‑filled sinkhole in the Limestone Coast region of South Australia, located near the volcanic cone of Mount Schank (South Australia Tourism Commission, official state tourism body). The site sits between Mount Schank and Mount Gambier within the Kanawinka volcanic area, a landscape shaped by ancient volcanic activity and limestone dissolution.

Geological classification

The lake is classified as a cenote — a natural sinkhole formed when limestone collapses over an underground cavity. Unlike a typical pond or lake, its water comes from an underground source rather than surface runoff, which explains its stable, cold temperature year-round (Wikipedia, community‑edited encyclopedia). The South Australia tourism authority describes it as a volcanic sinkhole set in a paddock that the public can swim in.

Location and accessibility

The lake is a 15-minute drive from Mount Gambier’s town centre, making it an easy day trip for visitors staying in the region. The access point features a set of stairs leading down to a floating pontoon, installed to improve safety for swimmers and divers (South Australia Tourism Commission). The cliffs surrounding the lake rise about 8 metres above the water surface, and the lake itself has a diameter of roughly 40 metres.

Popular activities

Swimming is the main draw, along with cave diving for certified divers. The South Australia tourism authority notes that access for cave diving is limited to holders of the CDAA (Cave Diving Association of Australia) Deep Cavern grade. Snorkeling is also possible when water clarity is good, though visibility can vary with algal conditions.

The upshot underscores that this site demands respect for its unique geology and safety rules.

How cold is the Little Blue Lake?

The water temperature at Little Blue Lake sits in a consistently cold range year-round, typically between 12 and 16°C. A visitor guide reports that on‑site information boards state the temperature as 12°C all year (Swimming Hole Heaven, visitor guide), while a commercial water‑temperature page recorded 14°C at the time of measurement (SeaTemperature.net Australia, water temperature aggregator). Some visitors describe the water as “chilly” even in the height of summer.

Year‑round temperature range

The table below summarises the reported temperature data from multiple sources.

Why the water stays cold

The cold temperature is a direct result of the lake’s depth and its underground water source. Unlike shallow surface ponds that warm up in summer sunlight, Little Blue Lake is fed by groundwater that has passed through cool limestone strata. The depth — up to 47 metres at its maximum (South Australia Tourism Commission) — means the bulk of the water volume never sees direct sunlight, helping it maintain a stable thermal profile.

Comparison to other swimming holes

Most surface swimming spots in South Australia’s Limestone Coast region fluctuate with air temperature. Little Blue Lake, by contrast, stays cold regardless of the season. For context, the nearby Blue Lake in Mount Gambier varies from about 11°C in winter to 20°C in summer — a wider range driven by its larger volume and different water source. Little Blue Lake’s narrow temperature band makes it one of the most consistent cold-water swims in the area.

This consistency makes it a reliable destination for those seeking a genuinely cold swim any time of year.

How long is the Little Blue Lake walk?

The walking track around Little Blue Lake is short — approximately 500 metres — but the exact length is not widely documented by official sources. Most visitors complete the loop in a few minutes, making it more of a stroll than a hike.

Walking track around the lake

The trail circles the sinkhole rim, offering views down into the lake from various angles. The path is unpaved in sections and can be uneven near the edges. No official signage marks the distance, which is why the length remains approximate across visitor accounts.

Stair access to the water

The main access to the water is via a set of stairs that descend from the rim down to the floating pontoon. The stairs are the only designated entry point for swimmers. The South Australia tourism authority notes that cliff jumping is dangerous and prohibited — the stairs and pontoon are the safe route in and out (South Australia Tourism Commission).

Nearby walking options

For visitors who want a longer walk, the Blue Lake Circuit in Mount Gambier is a separate, 3.6‑km trail around the much larger Blue Lake. This is a different location about 15 minutes away by car and should not be confused with the short loop at Little Blue Lake.

The implication: if you come expecting a proper bushwalk, you will be done in under 10 minutes. The walk at Little Blue Lake is a scenic overlook loop, not a hiking trail.

Can you camp at Little Blue Lake?

Direct camping at Little Blue Lake is not permitted. The South Australia tourism authority explicitly states that “camping is not permitted at the Little Blue Lake or in the car park” (South Australia Tourism Commission).

Camping at the lake itself

No overnight stays are allowed on the property. The car park closes at dusk, and there are no designated campsites, fire pits, or facilities for overnight use. Visitors who attempt to camp may be asked to leave by local authorities.

Nearby caravan parks and campsites

Several accommodation options exist within a short drive. Discovery Parks Goolwa (Discovery Parks Goolwa guide) is one option in the broader region, though it is about a 2‑hour drive away. Closer to Mount Gambier, visitors can find caravan parks, holiday parks, and private rentals through standard booking platforms. The South Australia tourism authority recommends booking in advance during peak season.

Rules and permits

No special permits are required for day visits. The only permit‑restricted activity is cave diving, which requires the CDAA Deep Cavern grade. The lake is open to the public free of charge, though visitors should check for temporary closures due to algal blooms or maintenance.

The pattern: Little Blue Lake is a day-use destination. If you want to stay overnight, you need to drive into Mount Gambier or book a nearby caravan park. The lake itself has no lodging infrastructure, and that is by design — it keeps the site from becoming a campground.

How was the Little Blue Lake formed?

Little Blue Lake is a natural sinkhole that formed through the collapse of limestone over an underground cavity, a process that unfolded over thousands of years (Wikipedia). The geology parallels that of the cenotes found in Mexico’s Yucatán Peninsula, making it a relatively rare feature in Australia.

Limestone dissolution

The Kanawinka volcanic area sits on a foundation of limestone laid down when the region was under the sea. Over millennia, slightly acidic groundwater slowly dissolved the limestone, creating a network of underground voids and channels. This process — karst dissolution — is the same mechanism that forms caves and sinkholes worldwide.

Collapse and sinkhole formation

When the underground cavity grew large enough, the overlying limestone and soil could no longer support their own weight. The roof collapsed, creating the steep-sided depression that now holds the lake. The cliffs that rise about 8 metres above the water are the exposed walls of that collapse (South Australia Tourism Commission).

Comparison to cenotes

The term cenote — borrowed from the Yucatán Maya word tsʼonot — applies to any sinkhole that exposes groundwater. Little Blue Lake fits the definition precisely: a collapse sinkhole with a permanent water body fed by an underground source. Unlike many Mexican cenotes, which are often open to the sky and surrounded by jungle, Little Blue Lake sits in a cleared paddock in South Australia’s farming country. The geological mechanism, however, is identical.

The following table encapsulates the lake’s key measurements and rules.

The confirmed facts give visitors a solid foundation for planning, while the unknowns highlight areas where firsthand reports are still thin.

The three perspectives — a local tourism social post, an encyclopedia entry, and an official government listing — converge on the same story: Little Blue Lake is cold, deep, and managed for safe public access. The gap between them is mainly in detail depth, not in facts.

For visitors planning a trip to the Limestone Coast, the choice is clear: Little Blue Lake offers a genuinely cold, geologically unique swimming experience that few other spots in South Australia can match. The trade-off is that it is a day-use site with no camping, cold water every month of the year, and rules designed to keep swimmers and divers safe. Come prepared for the temperature, respect the restrictions, and you will find one of the most consistent natural swimming holes in the state.