Massachusetts Bay is a large body of water located in the northeastern United States, part of the Atlantic Ocean. It is bordered by the state of Massachusetts to the south and east, and it includes several important cities, such as Boston and Salem. The bay is known for its rich maritime history and serves as a vital shipping route. The bay is also home to numerous islands, including Cape Cod and Nantucket, which are popular tourist destinations. Its waters support a diverse ecosystem, providing habitats for various marine life, including fish and seabirds. The area is significant for both recreational activities and commercial fishing.