never seen water like this

Lying between the Atlas Mountains and the northern boundary of the Sahara is an expanse of salt flats that, after rains, produce shallow mineral ponds and lakes colored red.

A view of one of the spots at Iguazu where water flows with the most force.

Where the Dordogne flows into the Gironde estuary, there is occasionally a surfable tidal bore.

This unnamed pond in the Swiss Alps has developed a film of deep red algae on its surface, though the water immediately underneath remains clear.