This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Rio celeste. Rio Celeste sky blue river at Tenorio National Park The sky blue waters are colored by the sulphur from the dormant volcano beneath the mountain Transferred from org en Original uploader was Asequeir at org en Released into the public domain by the author en Asequeir Original upload log page en Rioceleste