The Seven Coloured Earths at Chamarel are one of Mauritius’s most famous natural curiosities, a landscape of undulating dunes in shades of red, brown, violet and blue caused by weathered volcanic ash. Part of a ticketed geopark that also includes a lofty waterfall and a giant-tortoise enclosure, the site lets visitors admire the surreal, striped terrain from viewing platforms. Set amid the lush south-western uplands, it is a striking and easily accessible highlight of any island tour.