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Tomas Rivero rows the boat as Samuel Delgado casts a net as the two men fish on the Pilcomayo River outside of Villamontes, Bolivia. Rivero is a leader of the Union of Pilcomayo River Fishers, and an advocate for cleaning up the river, which has been plagued by contamination from upstream mining and road construction. This portion of the river is inside the protected Aguaragüe National Park and Integrated Management Natural Area.