Whitehaven Beach in Australia, The Whitsunday Islands.
They are uninhabited and this beach is unique in the world in that the sand, which is 99% silica is brought in from out at sea so that only the finest lightest grains which are near the surface out at sea are deposited on the beach. It makes the sand beautifully fine and white - I haven't altered the colours at all.
Canon EOS 450D
1/250 second
F/11.0
ISO 100
18 mm