Machias Bay is a coastal inlet located in Maine, USA. It is part of the larger Gulf of Maine and is known for its scenic beauty and rich marine life. The bay is surrounded by several small towns, including Machias and East Machias, which offer access to various recreational activities such as boating and fishing. The bay is historically significant, as it was the site of the Battle of Machias during the American Revolutionary War. Today, it serves as a habitat for various species of birds and marine animals, making it a popular spot for nature enthusiasts and wildlife watchers.