Lake Hillier

Lake Hillier, Australia

Low-angle sunrise view of Lake Hillier's pink waters framed by paperbark branches on Middle Island, Western Australia.

A salt lake on a remote Western Australian island, pink for reasons scientists link to a tiny living organism.

The place

Lake Hillier is a salt lake close to the shore of Middle Island, the largest of the islands in the Recherche Archipelago off the southern coast of Western Australia. Its defining feature is its colour. The water is a strong pink, and the shade holds when you scoop some into a container rather than fading the moment it leaves the lake. Researchers think the tint comes from Dunaliella salina, a single-celled alga that thrives in very salty water, and genetic surveys of the lake have also picked up bacteria and archaea living alongside it.

The lake is roughly 600 metres long and about 250 metres across, a modest feature on a modest island. A rim of pale sand encircles it, and beyond that dense woodland of paperbark and eucalyptus comes down to the margins. On the northern side a narrow band of vegetated dunes separates the water from the island's northern coast, so the lake never quite meets the sea. The land around it is quiet and largely undeveloped, and the Southern Ocean, called the Indian Ocean in some definitions, lies just beyond the dunes.

The colour is not constant. In recent years the pink has noticeably faded, and heavy rainfall is the main explanation, because fresh water dilutes the salt that keeps the lake so saturated. A paler lake is still a salt lake. The change is a reminder that the pink depends on conditions that shift from year to year.

Its story

The first written account of Lake Hillier comes from Matthew Flinders, the navigator, whose expedition was charting Australia's southern coast at the start of the nineteenth century. Climbing the highest point on Middle Island, he looked down on a small rose-coloured lake in the north-east. He was told the water was so heavy with salt that crystals gathered along the shore in quantities enough to load a ship, and that a sample needed nothing more than drying to be usable. The lake, in other words, was a resource from the moment anyone saw it.

Flinders came back to Middle Island some sixteen months later, planning a stay of a day or two in Goose Island Bay. His aims were practical: geese to feed sick crew, seal oil for lamps, and salt gathered from the lake. Before the expedition sailed again, a crew member named William Hillier died of dysentery on the island, and Flinders honoured him by naming the lake after him. The name has outlasted almost everything else the expedition left behind.

Later, in the late nineteenth century, the salt itself became the focus. Edward Andrews explored the possibility of making salt at scale, relocating to the island with his two sons. They mined the salt deposits for roughly a year before leaving. Salt mining on the lake continued for a time after that, but it never became a lasting industry. Today the island lies within a nature reserve, and the lake is valued for its colour and its place in the coastal landscape rather than for what can be taken from it.

What to see

Culture

Lake Hillier lies on land whose traditional owners have lived on this coast for a very long time, and that history shapes how the region talks about itself today. Across Western Australia, native title and mining remain sharp points of debate. Mining drives much of the state's economy, yet consultation with Indigenous landowners has too often fallen short, and sacred sites have been lost, including Juukan Gorge, a sacred site blown up by the mining company Rio Tinto. The same tension runs through arguments about renewable energy and coastal conservation. Conversation is often frank, so listen more than you speak, especially on a boat trip where guides may explain the significance of the land. Stay on the tracks your operator uses, and treat what your guide tells you about Country as seriously as you would a museum label.

What to wear

Lake Hillier sits on a remote island, so what people wear here is shaped more by the boat, the wind and the sun than by any single local style. Traditional dress across this part of Western Australia was practical. Aboriginal communities made clothing, bags and cords from animal skins and woven plant fibres, and ochre and body decoration were central to ceremonial life. Few of those textile traditions are worn every day now, but they remain part of art, dance and community events in the region.

What people wear today is largely practical outdoor clothing: light long-sleeved shirts, sun hats, sturdy closed shoes and a waterproof layer for the boat. Visitors should pack a wide-brimmed hat, sunscreen, sunglasses and a windproof jacket, because the crossing and the open island are exposed. Wear shoes with grip for sand and rock, and bring a spare pair of socks for the return trip. No religious dress rules apply on the island, but if you are invited to a community event, dress modestly and follow the lead of the people hosting it.

What to eat

Plan it

Best time. June to August suits boat trips, when the days are coolest, though those months are also the wettest. The pink is strongest after a dry stretch, because heavy rain dilutes the salt that keeps the colour vivid, so check recent rainfall before you go.

How long. 1–2

Getting there. Fly into Perth, the state's main international gateway, then take a domestic flight or a long drive south to the coast. Regular boat trips rarely stop at Middle Island, so a scenic flight from Esperance Airport is the most common way to see the lake.

Budget. high

Tips

Etiquette

Nearby

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