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Seven coloured Earths are a geological formation in the Chamarel plain in south-western Mauritius.

It is a small area of sand dunes comprising sands of seven colours (aproximately red, brown, violet, green, blue, purple and yellow). These sands settle in different layers acquiring a surrealistic, striped colouring.

The sands formed from the decomposition of volcanic rock into clay, further transformed into ferrallitic soil by hydrolysis. the two main elements of the resulting soil are ion and aluminium, responsible for the colours.

Another interesting feature is that the dunes seemingly never erode, in spite of Mauritius' torrential tropical rains.