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Answer:
Dam
Explanation:
The Panama Canal was built by damming the Chagres River and creating Gatun Lake and Lake Madden, then cutting the Gaillard Cut between the two lakes and crossing the Continental Divide, constructing locks between the Atlantic Ocean and Gatun Lake to hoist boats to the lake, as well as another set of locks at the Gaillard Cut's end to lower ships, and digging a passage to the Pacific Ocean