The Todrha Gorges are a series of limestone river canyons, or wadi, in the eastern part of the High Atlas Mountains in Morocco, near the town of Tinerhir. Both the Todgha and neighbouring Dades Rivers are responsible for carving out these deep cliff-sided canyons, on their final 40 kilometres (25 mi) through the mountains. The height of the canyon walls can vary, but in some places can be up to 400 metres (1,312 ft) high. (Wikipedia)