The fascinating sinkholes in Mount Gambier to visit

Dilvin YasaBy Dilvin Yasa
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Fancy a swim in a dazzling cobalt waterway, or a stroll around a lush, emerald wonderland? The famous Mount Gambier sinkholes can set the mood for every kind of adventure.

Reykjavik, Naples, Cartago; when you’re yearning to explore a dramatic volcanic landscape, there’s only one destination where the sinkholes – a depression caused by the collapse of the surface layer – are a celebration (particularly in the warmer months): Mount Gambier  on South Australia’s spectacular Limestone Coast.

Proving that good things are worth the wait, geologists believe that Mount Gambier’s (justifiably) famous sinkholes are the result of rain on the region’s three fault lines breaking up the huge expanse of limestone, more than 25 million years old, spanning South Australia’s south-east. Water flowing through the limestone has formed 50 sinkholes, with at least 15 of them filled with water.

So, when is the best time to take advantage of Mount Gambier’s sinkholes? While Mount Gambier itself is a treat to visit year-round, aqua babies are best to plan a trip in the warmer months, between November and March, when the water is less biting and the colour morphs from a hue which can fall anywhere from steel grey or garden variety blue to vibrant cobalt. The good news? Whether you hire a car and drive to each spot (easily done since most of the major holes are located within a 20-minute drive of one another) or book a tour, there’s the perfect sinkhole experience for every kind of traveller, including these tourism-heavy hitters.

Kilsby Sinkhole

sunlight shines upon a diver underneath the Kilsby Sinkhole
Kilsby Sinkhole is a naturally occurring karst basin. (Image: Adam Stern)

Will it be snorkelling, scuba diving, free diving or a sinkhole tour of the training site for the South Australian Police? At Kilsby Sinkhole , located on a sheep farm among the rolling grasslands of Moorak just 14 kilometres south of Mount Gambier, you can choose all of the above.

Out here, where it’s not unusual for people to show up in mermaid outfits for the ultimate photoshoot, water clarity has drawn people to the site for decades, the giant chasm descending 65 metres and allowing up to 50 metres (most days) visibility for scuba drivers and freedivers, and pristine water clarity for those who prefer to frolic towards the surface. 50-minute guided tours cover the sinkhole’s fascinating history and geology – a real hit with the kids.

a diver facing the light as it passes through the water under Kilsby Sinkhole
It’s a stunning sight when the sun rises over Kilsby Sinkhole. (Image: Adam Stern)

Snorkelling tours run for two hours, complete with a safety briefing and under the supervision of a snorkel supervisor, while those interested in diving and freediving can book a licensed operator to help their dream come true.

Kilsby Sinkhole is a privately owned site, thus, all visits must be pre-booked online. The good news? They now offer a range of two-bedroom luxury villas at a surprisingly affordable price point, so you can take advantage of the sinkhole (and its surrounds) day after day.

Umpherston Sinkhole

a large crater at Umpherston Sinkhole
Subaquatic flora grows abundantly in Umpherston Sinkhole. (Image: Offroad Images)

In the middle of Mount Gambier’s city streets, a lush, subterranean oasis blooms some 20 metres deep in a natural well providing cool respite for those who want to escape those blazing days, but don’t much fancy getting wet.

Named after its designer James Umpherston who designed this urban botanic garden in the late 1800s, Umpherston Sinkhole/Balumbul (one of the most photographed locations on the Limestone Coast) was once a cave formed through the dissolution of the limestone, becoming a sinkhole only after the top of its chamber collapsed and its topsoil provided the perfect environment on which flora to grow.

lush greenery at Umpherston Sinkhole
Stroll through the enchanting vines. (Image: South Australian Tourism Commission/Adam Bruzzone)

Now it’s best described as a gateway to a secret world filled with hanging vines and terraces, the depth and scale of which is best enjoyed from the viewing platforms before taking a walk down to the bottom to view the hydrangeas (but only after grabbing an ice cream or coffee from the onsite kiosk). Yep, at Umpherston Sinkhole, it’s all about walking and observing.

Beautiful any time of day, locals swear by a visit at dusk when the friendly locals, the Umpherston possums, come out to greet their visitors. Why not stick around and make use of the free barbecue area?

Little Blue Lake 

an aerial view of the Little Blue Lake sinkhole in Mount Gambier
Little Blue Lake is situated within a dormant volcanic crater. (Image: Thomas Cowey)

Disregard its name; Little Blue Lake is actually a sinkhole with a difference: the ability to change colour like a mood ring so that the steel grey it rocks throughout the winter months transforms into a vibrant cobalt blue come the summertime (November to March). It’s all thanks to a phenomenon caused by the formation of calcite crystals warmed by the rays of the sun.

Located in the Kanawinka volcanic area, wedged between the two (mercifully) dormant volcanoes of Mount Gambier and Mount Schank, follow the campervans making a line to Little Blue Lake, which is conveniently situated in a paddock by the highway.

a diving platform above the milky turquoise waters of Little Blue Lake, Mount Gambier
Mount Gambier’s Blue Lake transforms into milky turquoise between November and March. (Image: Lucy Adamopoulos)

With a 47-metre depth, plus a diameter of 40 metres, the lake is what you might call bracing – a fact locals love and visitors quickly get used to as they enter the sinkhole via the stairs or ramp. Your best bet? Warm up beforehand or afterwards by lying out in the sun, or by enjoying a picnic (you’ll have to bring your own provisions). Just beware that there are no public amenities, so best to use the bathroom before you depart from your accommodation.

Got plenty of time in and around Mount Gambier up your sleeve and are keen to experience further sinkholes? Be sure to also put Ewens Ponds, Hell’s Hole and Caroline Sinkhole on your list.

Wanting to explore the rest of Mount Gambier? Follow our guide for awe-inspiring things to do in Mount Gambier.

Dilvin Yasa
Dilvin Yasa is a freelance journalist, author and TV presenter whose travels have taken her from the iceberg graveyards of Antarctica to the roaring rapids of Uganda. Always on the lookout for that next unforgettable meal, wildlife moment or 80s-themed nightclub, she is inexplicably drawn to polar destinations despite detesting the cold.
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Your guide to slowing down in the Yarra Valley & Dandenong Ranges

    Gemma KaczerepaBy Gemma Kaczerepa
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    There’s no better place to unwind than the Yarra Valley and Dandenong Ranges – a leafy and idyllic region shrouded in mist, fern-filled gullies and a peaceful atmosphere.

    Wrapped in the crisp mountain air, ancient ferns and ethereally verdant landscapes of the Yarra Valley and Dandenong Ranges , you’d be forgiven for thinking you’re in another world (or at least another part of the planet).

    But this gorgeous pocket is under an hour from Melbourne, a mix of top-notch food and wine, boutique stays and forested scenery that make for an easy weekend away or even a midweek escape. In fact, visiting during the week can offer a deeply relaxing experience, with fewer crowds and more space to linger.

    If you’re keen to unwind, here’s how to spend your time in this idyllic neck of the woods.

    Where to eat

    Yarra Valley Dairy
    Treat your taste buds to Yarra Valley Dairy. (Image: Visit Victoria)

    From farm gates to cosy eateries, the Yarra Valley and Dandenong Ranges house a plethora of places to feast. Start your day with a leisurely brunch and coffee at Ripe . This local hangout combines warm hospitality and hearty cafe fare against a backdrop of the hills’ iconic tree-fern canopies. It’s also nestled in the heart of Sassafras, the quaint village that best captures the Dandenong Ranges’ old-world charm.

    Next, take yourself on a gastronomic adventure. Visit Yarra Valley Dairy , a regional favourite doing handmade cheeses, or Cherry Hill Orchards , where in summer you can pick your own cherries and enjoy them in the farm’s picturesque grounds. Treat yourself to a tasting at one of the Yarra Valley’s renowned wineries to finish – Rochford , Re’em and De Bortoli are standout picks for a sample of the region’s signature drops.

    By night, book a table at either Citrine in the mountain town of Olinda or restaurant 1309 at Balgownie Estate in the Yarra Valley. Both do elevated seasonal fare paired with excellent drinks.

    And if you’re simply in the mood for a tipple, you’re spoiled for choice. The Alpine Hotel in riverside Warburton is a historic and character-filled spot pouring pints and locally made drinks, while Four Pillars is a must for gin lovers. The distillery’s award-winning spirits are famed nationwide, but here you can try them right from the source.

    Things to do outdoors

    two people walking through Dandenong Ranges National Park
    Wander the Dandenong Ranges National Park.

    A motley patchwork of misty rainforest, rugged bushscapes and beautifully tended gardens, the Yarra Valley and Dandenong Ranges are some of Melbourne’s most scenic pockets. No visit to the region would be complete without a wander through its lush surrounds, either by bike or on foot.

    The Ngurrak Barring trail stretches 39 kilometres through the Dandenong Ranges, connecting the towns and fern-filled forests that make the hills so unique. Along the way, be immersed in thought-provoking art installations and cultural stories, sharing a different perspective of this ancient landscape.

    While in the area, wander through Cloudehill Garden & Nursery and the Dandenong Ranges Botanic Gardens , situated in Olinda. The cooler climate, rich volcanic soil and consistent rainfall offer both gardens ideal conditions for vivid and vibrant flora.

    Over in the Yarra Valley, the 40-kilometre Lilydale to Warburton Rail Trail is a flat and family-friendly path perfect for leisurely bike rides and longer walks. It takes you through vine-lined scenery and towns like Seville and Wandin. Biking enthusiasts should head to the Warburton Mountain Bike Destination, a network of 160 kilometres of trails that traverse through untamed terrain.

    For a more laidback outing, Alowyn Gardens encompasses seven acres of themed gardens perfect for a meandering stroll. The nearly 100-metre-long wisteria archway that connects different garden zones is a highlight – especially in October, when the lilac blossoms are in spectacular bloom.

    The arts and culture scene

    TarraWarra Museum of Art
    Take in the displays at TarraWarra Museum of Art. (Image: Visit Victoria)

    Yarra Valley and the Dandenong Ranges are havens for arts and culture thanks to their inspiring landscapes and thriving creative community. Naturally, a slower escape should include a visit to some of the region’s best studios and galleries.

    The TarraWarra Museum of Art in Healesville showcases modern and contemporary Australian art, with both a permanent collection and a rotating display of thoughtful exhibitions. The building and grounds are well worth exploring: a striking architectural landmark amid landscaped lawns and open-air sculptures overlooking the Yarra Valley.

    Delve into the area’s rich history at the Yarra Ranges Regional Museum , a treasure trove of more than 13,000 unique pieces. See everything from Indigenous artefacts to archival photographs and historical objects that tell the region’s story.

    On your way back to the city, stop by the leafy enclave of Eltham to discover Montsalvat . This five-acre artistic playground is Australia’s oldest continuous art community, combining galleries, Gothic-style buildings and expansive heritage gardens.

    Stay at a local retreat

    Re’em yarra valley accommodation
    Re’em is an ideal pick for an indulgent stay.

    No matter your style, and no matter your budget, you’ll find a suitable spot in the region to rest your head. If the weather is warm and the sky is clear, set up a tent at BIG4 Yarra Valley Park Lane Holiday Park or Pine Hill Cabin & Caravan Park. The former has secluded camping spots surrounded by tranquil bushland and local wildlife, along with glamping pods and cabins. The latter has powered and unpowered sites suitable for all kinds of campers, and is pet-friendly if you’re travelling with your four-legged friend.

    Or, book yourself into the RACV Healesville Country Club & Resort – a sprawling retreat complete with stylish rooms and luxe amenities that invite you to unwind. Relax at the day spa, tee off at the 18-hole golf course, or recharge with a round of tennis or a few laps in the pool.

    And if you’re after something truly indulgent, Re’em is an ideal pick. A boutique collection of just 16, the luxuriously appointed rooms feature plush linens, high-end amenities and oversized baths with panoramic views across the estate. A gourmet breakfast showcasing gorgeous local produce is also included.

    Start planning your reset getaway at visityarravalley.com.au.