Meet the site
Ewens Ponds is the gentle counterpart to Piccaninnie – three round, spring-fed sinkholes on Eight Mile Creek, each about 9-10 m deep, joined by shallow channels and so clear that visibility beyond 80 m has been reported. It is the one Mount Gambier freshwater site where Open Water divers can join a guided tour without any cave training, and it is one of the region's classic snorkels.
The appeal is the plants. Because the water is so clear, aquatic vegetation grows to about 6 m depth, and National Parks SA notes species that are not found growing fully submerged anywhere else in the world. The pond walls drop steeply from the edge, lined with swaying green growth, down to floors of fine white silt; in the channels the current eases you over meadows of weed a metre or two below the surface. The third pond contains a small natural cave, and the whole 365 m route is swum one-way, from Pond 1 to Pond 3, in about 30-45 minutes. Wildlife is modest but interesting – eels, small native fish, freshwater crayfish and crabs – and the underwater light on a bright day is superb for photography.
The rules exist to protect a fragile Ramsar-quality wetland: groups of 2-6 snorkellers, one one-hour slot per person per day, full-length wetsuit, short fins under 55 cm, no weight belts, no standing, no swimming back upstream. Scuba is allowed only on accredited guided tours, and freediving and inflatables are banned. In recent years falling groundwater and algae have forced closures and changed permit conditions, so availability is not guaranteed. When it is open, Ewens suits beginners, snorkellers, families with children over six and photographers who want an easy, beautiful freshwater dive.
Research this site before booking Stored site notes may be historical. These questions highlight gaps without turning old instructions into a current dive plan.
Ewens Ponds is recorded as Freshwater Lake/River in Mount Gambier Sinkholes & Caves. The listed access is shore. Confirm the actual meeting point, route and permission to visit; a map pin does not establish any of these.
Historical access notes exist for this record, but have not been independently verified for current use. Request current directions from the operator or site manager rather than following an old entry description.
Questions, answered
Is Ewens Ponds suitable for my certification?
The record lists Open Water. That does not establish suitability for every route or day. Share your training, recent experience and equipment needs with the operator and ask about the specific proposed dive.
Can I book Ewens Ponds through YouDive?
YouDive is an independent research directory. Contact an operator directly to confirm whether it currently runs the trip, the inclusions and the booking terms.
What you might see
Unique fully submerged aquatic plants, stoneworts and weed, short-finned eels, pygmy perch and other small native fish, freshwater crayfish (yabbies), crabs, freshwater shrimp
Location
Three spring-fed limestone sinkhole ponds, each about 10 m deep, linked by shallow channels on Eight Mile Creek, 69 Ewens Ponds Road, about 25 km south of Mount Gambier.
Facilities nearby
Sealed parking including bus parking, toilets (incl. accessible), walking track between ponds; no equipment hire on site – hire and fills in Mount Gambier.
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
parks.sa.gov.auparks.sa.gov.aucavedivers.com.audive-experience.rezdy.comen.wikivoyage.orgRecord updated 26 Sept 2026. Source claims are being reviewed.