Chagres River

The Chagres River, in central Panama, is the largest river in the Panama Canal's watershed. The river is dammed twice, and the resulting reservoirs—Gatun Lake and Lake Alajuela—form an integral part of the canal and its water system. Although river's natural course runs northwest into the Caribbean Sea, its waters also flow, via the canal's locks, into both the Caribbean Sea to the north and the Gulf of Panama to the south, entitling the Chagres to the unusual claim of drainage into two oceans.