Lake Thetis

Lake Thetis is a remarkable saline lake near Cervantes in Western Australia, renowned for its living marine stromatolites—some of the oldest life forms on Earth. These ancient, rock-like structures offer a rare window into the planet's early history and are easily accessible via a boardwalk that protects the fragile ecosystem. The stark, otherworldly landscape, with its crystalline waters and limestone formations, feels like stepping onto another planet.

Highlights & What to See

• Stromatolite Boardwalk: A 450-metre loop trail with interpretive signs that explains how these microbial communities build layered mounds, similar to fossils dating back 3.5 billion years. Best viewed at low light for optimal visibility.
• Pink Lake Hues: Depending on the season and salinity, the lake can take on a soft pink tint, especially striking during late afternoon.
• Birdwatching: Spot pelicans, black swans, and migratory waders along the shoreline; bring binoculars for the best views.
• Nearby Cervantes: A short drive away, this fishing town offers fresh lobster (crayfish) and a laid-back harbour—perfect for a seafood lunch after exploring the lake.

Suggested Time to Spend

Allow 1–2 hours to walk the boardwalk, read the interpretive panels, and take photos. Combine with a visit to the Pinnacles Desert in Nambung National Park, about 20 minutes south, for a half-day excursion from Cervantes or a longer stop on a Perth-to-Geraldton road trip. Early morning or late afternoon visits provide the best light and smaller crowds.

Nearby Areas Worth Combining

• The Pinnacles Desert (Nambung National Park): Thousands of limestone pillars rising from golden sand dunes—a surreal landscape and the region's star attraction.
• Hangover Bay: A stunning white-sand beach with turquoise waters, ideal for a swim or picnic after the desert.
• Jurien Bay Marine Park: Snorkel with sea lions and explore coral reefs; about 30 minutes north of Cervantes.
• Stockyard Gully National Park: A hidden gem with limestone caves and a seasonal creek, accessible by 4WD—great for adventurous travellers.

Please check official sources for current details.