The cerulean blue color of the Celeste River in northern Costa Rica is caused by the mixing of the highly acidic waters of Quebrada Agria with aluminosilicate particles in the Buenavista River, an optical phenomenon known as Mie scattering.

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The cerulean blue color of the Celeste River in northern Costa Rica is caused by the mixing of the highly acidic waters of Quebrada Agria with aluminosilicate particles in the Buenavista River, an optical phenomenon known as Mie scattering.