Petra lies about 3-5 hours south of modern Amman, about 2 hours north of Aqaba, on the edges of the mountainous desert of the Wadi Araba. The city is surrounded by towering hills of rust-coloured sandstone which gave the city some natural protection against invaders.
The site is semi-arid, the friable sandstone which allowed the Nabataeans to carve their temples and tombs into the rock crumbling easily to sand. The colour of the rock ranges from pale yellow or white through rich reds to the darker brown of more resistant rocks. The contorted strata of different-coloured rock form whorls and waves of colour in the rock face, which the Nabataeans exploited in their architecture.
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