Looking northwest across Dixon Entrance from Baron IslandThe Dixon Entrance as delineated by BC Geographical Names and the disputed "A–B Line", along with Hecate Strait and Queen Charlotte Sound.[1] Red dots indicate capes and points, gray text indicates island names. The international boundary between Canada and the United States follows Portland Canal to "Point B", thence, according to Canada, to Cape Muzon. The purpose and significance of the "A–B Line" portion of the boundary are disputed.