A canal can cut across a drainage divide atop a ridge, generally requiring an external water source above the highest elevation. The best-known example of such a canal is the Panama Canal. Many canals have been built at elevations, above valleys and other waterways.
Boston's Canal Street is where the route once extended from the Charles River to Boston Harbor. But it's still possible to find an unguided and unmarked way along a dozen stretches of the canal where its waters still flow through granite embankments.
A canal is a human-made waterway that allows boats and ships to pass from one body of water to another. Canals are also used to transport water for irrigation and other human uses.
The 7-mile-long Cape Cod canal is a sea-level canal that cuts through the neck of land that connects the Cape to the rest of the state. It shortened the sea travel between Cape Cod Bay and Buzzards Bay by 135 miles.