Rio Celeste in Central American nation, wherever the parable is that the water gets its bright color from gods United Nations agency would paint the sky blue and rinse their brushes within the stream

This a beautiful river. You can go further downstream of it to hike on a trail to be able to swim in the river (small fee). Definitely worth it.

Was there in December! Very beautiful, and a beautiful hike despite the traffic.

For those who may not know, the water gets its blue color from the mixing of two colorless rivers upstream - one carries aluminosilicates, and the other has high acidity. When combined, the drop in pH causes the aluminosilicates to form spherical aggregates that scatter light in a way that lets us see the turquoise color (an example of Mie scattering)!