Casco Bay Lines is a ferry system that provides year-round passenger, freight, postal and vehicle ferry service to the islands of Casco Bay from Portland, Maine. For over 150 years, our vessels have been transporting people from Portland to the islands of Casco Bay. Whether you are commuting, visiting for a day, staying for an extended vacation, or enjoying one of our scenic or music cruises – Casco Bay Lines is your fun, safe, reliable and convenient connection to the islands.