Written by Ben Cole· Updated Mar 2026Quick Actions
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About Blue Lake (Mount Gambier)
A strikingly vivid blue crater lake within an extinct volcanic caldera in the city of Mount Gambier. The lake's remarkable cobalt blue colour appears each year between November and March (turning grey-green in winter) and is caused by calcite crystals suspended in the water as temperatures warm. The lake is 70m deep and is the primary drinking water supply for Mount Gambier.
About
A strikingly vivid blue crater lake within an extinct volcanic caldera in the city of Mount Gambier. The lake's remarkable cobalt blue colour appears each year between November and March (turning grey-green in winter) and is caused by calcite crystals suspended in the water as temperatures warm. The lake is 70m deep and is the primary drinking water supply for Mount Gambier. It sits in a caldera shared with Valley Lake and Leg of Mutton Lake.
Warnings
Getting There
Located within the city of Mount Gambier, 450km southeast of Adelaide via the Princes Highway. Well-signposted from the city centre.
Visitor Tips
- •Walk the full 3.6km perimeter for changing perspectives. Visit Valley Lake and Umpherston Sinkhole in the same trip — all within 5km.
Quick Facts
At a Glance
The Place
- Significance
- State
Plan Your Visit
- Entry
- Free
- Duration
- 1–2 hours
- Best Time
- November–March for the vivid blue colour
Location
- Region
- Limestone Coast
- State
- South Australia
Good to Know
Highlights
Activities
Features
Facilities
Nearby
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