The Charles River is a famous landmark in Boston, Massachusetts. It flows from Hopkinton to the Boston Harbor. This river has a rich history and is known for its scenic beauty. Many poets, artists, and authors have written about the Charles River. If you are looking for synonyms for the Charles River when writing about it, here are some options: the Charles, River Charles, and Charles River Basin. These synonyms are commonly used when referring to the river in conversation or writing. Overall, the river has become an inseparable part of Boston's history and a symbol of the city's identity.