In Costa Rica, south of Lake Nicaragua, a series of volcanos dot the landscape from the northwest to the southeast. One of those is the triple-humped Volcan Tenorio, famous as the headwaters for the Rio Celeste. A sulfurous vent and calcium carbonate cause the river to run an opalescent blue. We hiked up into the cloud forest to the catarata, past blue lakes and bubbling hot springs. To the strange place where a white vein of mineral slashes across the crystal clear river. There the river is shocked immediately into its unlikely shade of blue.
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