Marina Bay on Boston Harbor is located on picturesque Dorchester Bay just minutes east of the Neponset River and only seven miles south of downtown Boston’s unmistakable skyline. This 686-slip marina, with access to some of northern New England’s richest waters, provides value, convenience and excellence. Our professional staff, first-class facilities and long list of services and amenities make Marina Bay the region’s premiere place to dock, store and service your vessel.