tenorio-volcano-national-park-of-costa-rica

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Celeste River is a river in Tenorio Volcano National Park of Costa Rica. It is notable for its distinctive turquoise coloration. The source of the river’s distinctive turquoise color is not a due to a chemical species but to a physical phenomenon known as Mie scattering, a scattering of light occurs when the particles causing the scattering are larger than the wavelengths of radiation in contact with them. (Source)