Tres Hermanas, Panama This unpaved road crosses the rural and self-sustaining Tres Hermanas community in Panama. But these lush valleys, home to dozens of towns, will be submerged if the Panama Canal Authority moves ahead with a plan to build a massive reservoir on the Indio River.

The lush river valleys of El Zaino y La Arenosa in western Panama, home to hundreds of families that eke out a living farming, fishing and raising cattle, could soon be submerged by a massive man-made reservoir designed to ensure the viability of the Panama Canal in the face of a changing climate.