A breathtaking ancient freshwater sinkhole on private farmland, Kilsby's Sinkhole offers gin-clear waters with visibility exceeding 60 metres. Suspended in dancing beams of light within this collapsed limestone cavern, snorkellers float above submerged rock formations and fossilised tree branches in a cathedral-like chamber. The 2-hour guided snorkel tour (all gear supplied) leads you through the ethereal, spring-fed pool surrounded by lush vegetation. Just 14 km south of Mount Gambier on South Australia's Limestone Coast, this is one of Australia's most extraordinary inland snorkelling experiences.
Kilsby's Sinkhole
BeginnerSKIP
SKIP
Poor conditions. Stay out today.
Showing last known conditions
Wave Height 1.9 mSwell Period 10 sWind Speed 7.4 knPrecipitation 19 mmTidal Phase slack
Last evaluated
The spot
Community-maintained
Community contribution: submitted by Daniel
Know before you go
Logged by the community, confirmed by mods
Moderate risk: Deep drop-offs
The sinkhole is deep (up to 30 m) with steep drop-offs beyond the snorkelling zone — stay within the designated guided area.
Low risk: Bee activity
Bee activity increases around the sinkhole during warmer months (spring and summer).
Low risk: Farm traffic
The sinkhole sits on active farmland, so drive carefully on access roads and mind livestock.
Low risk: Cold freshwater
The water in the sinkhole remains cool year-round; wetsuits are provided on guided tours but unprepared swimmers may experience cold shock.
Low risk: Limited entry/exit points
Access is via a single wooden stairway; exit is controlled and may feel confined for nervous swimmers.
Low risk: Private property access
The sinkhole is on private farmland; access is by booking only and unauthorised entry is not permitted.
Wildlife Guide
No wildlife notes for this spot yet.
Gallery
Be the first to share a photo
No photos yet — yours could be the first.
Photos are reviewed by moderators before they appear.
Getting in
Snorkel tour
Entry
14 km south of Mount Gambier, via Riddoch Highway (A66) then Sisters Road. The sinkhole is located on private property at 525 Sisters Rd, Moorak, SA.
Parking & facilities
On-site parking available on the private property.
parkingtoilets
Snorkel tour (2 hours): $99 per person (gear included). 1-hour sinkhole tour from $15.
Spot Map
Community
Trust
Is this spot real, accurate, still loved?
Spots near Victoria
No nearby spots yet.
Needs verification
Quick verify
One tap helps the community keep this spot honest.
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