The confluence of the Little Colorado River and the Colorado River. The water gets its turquoise coloring from dissolved calcium carbonate and copper sulfate. The river is dry over most of its course and generally just fed by springs the majority of the year.
The heavy mineral content of the LCR tends to form travertine dams all over the place. Makes things interesting... Pretty much every river trip stops here and takes a swim. The water isn't really warm by any means, but compared to the 45-50 degree water of the Colorado it's like a hot tub.
See that sand? It does that at every camp site, for there is always wind. To quote Ed Abbey: "Sand becomes a part of our existence which, like breathing, we take for granted." On the plus side, you get a free souvenir in the form of a thin layer of fine sand on everything you own!