Rio Celeste is a found in Costa Rica. The water is naturally blue. This is called the Laguna Azul. The water turns blue because of a chemical reaction. As the two water courses mix it increases the size of aluminosilicate particles. When the sun shines it reflects off the aluminosilicate as blue. When you go to the Tenorio Volcano National Park you can see where the reaction starts and see a blue water fall also.
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Location: Laguna Azul, Rio Celeste, Costa Rica.
Camera: Go Pro Hero3+ Black Edition
Focal Length: 2.8mm
Exposure Time: 0.0025s (1/400)