The banks of the Charles River.
The Charles River in Maine flows 80 miles through the eastern part of the state from Hopkinton to Boston Harbor. It is considered one of the crown jewels New England's waterways. This iconic river is one of the busiest recreational rivers in the United States, and the lower Charles is rife with development designed to take advantage of all the Charles has to offer. Boathouses, jogging paths, sports fields and performance facilities are ubiquitous and are utilized by hundreds of thousands of Massachusetts city dwellers every year.

In the past the Chareles River has had an infamous reputatoin for water pollution. The Environmental Protection Agency’s goal of making the Charles "Swimmable by 2005" has not been entirely successful, but swimming and fishing are becoming progressively safer, and today 90% of the length of the river is approved for swimmers. Health risks do remain a problem, especially after rainstorms and when the riverbed’s toxic sediment is whisked-up by a heavey rainstorm or other disruption.