The mountains to the northeast of the canal form a vast watershed that feeds the Chagres River, which was one of the country's principal waterways until it was damned to create the canal, and is now the source of nearly half of the water used in the locks. To protect the forests that help water percolate into the ground and keep the river running through the dry season, the Panamanian government declared the entire watershed a national park in 1985.
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