Whitehaven Beach is seven kilometres of sand on Whitsunday Island, off the Queensland coast of Australia, and the sand is 98 percent pure silica. Everything the beach does follows from that. The grains are as fine as flour and so evenly sized that they slip past one another instead of grinding, which makes them squeak audibly under every step you take. The same purity keeps them cool: pale quartz throws most of the sunlight back rather than storing it, so this surface never turns scorching at midday the way darker mineral sand does. It will also work its way into a camera body and seize it. And against something this white the shallow sea sorts itself into bands. Wading out slowly, you watch the water pale at your ankles and then darken to green as the bottom drops away, so what looked stacked from the shore becomes a gradient you move through.
At the northern end a short forest trail climbs to a platform above Hill Inlet, and that walk is the only shade on the island. From up there the pattern is legible. Over the hour or two after the tide turns, sand and water reorganise themselves, so the swirls are worth staying for rather than photographing and leaving. Down on the flat the inlet shelves so gradually that you can walk a long way out with the water still at your knees. It works as a nursery: stingrays glide over the bottom hunting soldier crabs and young lemon sharks patrol the edge of the channel, neither troubled by anyone standing still, so you shuffle your feet rather than stepping, to let a buried ray feel you coming. From November to May the boats hand out stinger suits, because box jellyfish are in the water. Long before any of this, these islands were Ngaro sea country, one of the oldest living maritime cultures in Australia, whose people crossed open water in canoes called winta, three ironbark panels sewn together with root fibre. Their fish traps, rock art and stone quarries still mark the islands.