Red River in Cusco, Peru. Its coloring is the result of red sandstone full of iron oxide that gets washed off the hillsides when it rains and turns the water a distinct red hue.
https://en.wikipedia.org/wiki/Kaieteur_Falls#:~:text=Kaieteur%20Falls%20is%20the
%20world's,Potaro%2DSiparuni%20region%20of%20Guyana.