Lake Thetis

On the edge of Western Australia’s Cervantes, Lake Thetis is a serene saline lake famed for its living fossils — thrombolites. These knobby, rock-like structures are among the oldest forms of life on Earth, and this is one of the few places you can see them up close. A boardwalk loops around the lake, offering easy access and interpretive signs that explain the science behind these ancient microbial communities. The setting is starkly beautiful: shallow turquoise water ringed by white salt crusts and low scrub, with the Indian Ocean’s blue just beyond the dunes.

Highlights & What to See

• Thrombolite Boardwalk — A 500-metre loop with viewing platforms that bring you right to the edge of the thrombolite fields. Best seen in the early morning or late afternoon when the light accentuates their texture and the water is glassy.
• Interpretive Signs — Learn how these microbialites differ from stromatolites and why Lake Thetis is so important to science. The signs are well-written and make the site fascinating for non-specialists.
• Birdwatching — The lake attracts pelicans, black swans, and a variety of shorebirds. Bring binoculars for the best views.
• Nearby Cervantes — Just 2 km away, this tiny fishing town has a jetty, a general store, and the Lobster Shack, where you can feast on fresh Western Rock Lobster.

Suggested Time to Spend

Allow 30–45 minutes to walk the boardwalk and read the signs. If you’re a keen photographer or birdwatcher, budget an hour. Lake Thetis is a perfect quick stop on a self-drive itinerary between Perth and the Pinnacles Desert, and it’s best combined with a visit to Cervantes for a lobster lunch.

Nearby Areas Worth Combining

• Pinnacles Desert (Nambung National Park) — 20 minutes south, this surreal landscape of thousands of limestone pillars is a must-see. Drive the loop or walk among the pinnacles at sunset.
• Cervantes — Grab a meal, stock up on supplies, or just enjoy the beach. The town’s jetty is good for a stroll and a view across the bay.
• Hangover Bay — A beautiful white-sand beach with turquoise water, perfect for a swim or picnic. It’s 15 minutes south of Lake Thetis.
• Jurien Bay — 30 minutes north, this coastal town offers snorkelling, sea lion tours, and the Jurien Bay Marine Park.
• Lancelin — 45 minutes south, famous for its massive sand dunes where you can try sandboarding or 4WD adventures.

Please check official sources for current details.