As other tributaries of the Amazon basin, the Kaka River has muddy waters because it drags clay and organic material. However, over the last few years, it started to become blackish due to the increasing amount of polluting liquids and metals dumped, for example, mercury.
read more... https://www.iwgia.org/en/news/4577-leco-indigenous-people-in-bolivia-being-slowly-poisoned-with-mercury.html
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