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The local legend, and the actual science.
There is a local saying that when God finished painting the sky, he rinsed his brushes in the Rio Celeste.
Two clear rivers
The science is simpler. Upstream, inside Tenorio Volcano National Park, two clear streams meet. Neither is blue on its own.
Where they join, differences in their chemistry cause tiny mineral particles to form and stay suspended in the water. Those particles scatter sunlight, and it's the blue part of the light that reaches your eye. The river isn't dyed at all: it is the light itself that turns blue.
When it's at its best
Because the colour depends on light and on clear water, it changes with the weather. After a few dry, sunny days, the blue is at its brightest. After heavy rain, sediment can cloud it for a time.
Downstream, at Villas Twilight
About three hundred meters of the Rio Celeste run along the property, a short walk down from the house, and you can take a dip.
