Uluru, with a height of 348 metres (863 metres above sea level) and a base circumference of 9.4 kilometres, is the world’s largest monolith. Uluru is made of coarse-grained sandstone known as arkose; the iron in the sandstone has oxidised, creating the rustyred surface. It is thought to be the peak of a 600-million-year-old mountain range 6 kilometres below the earth’s surface. Up close, Uluru is deeply grooved and indented, worn down over time by rain and wind. Its most stunning feature is that its colour changes according to the weather; in the sun it is a fierce red, while during rain the grooves host spontaneous waterfalls and the rock appears a more pensive purple-brown.

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