US Exclaves:
Because of the terrain, several municipalities in southeast Alaska (the "Panhandle") are inaccessible by road, except via Canada. Specifically, the town of Hyder, Alaska, is accessible only through Stewart, British Columbia, or by floatplane. Moreover, Haines and Skagway are accessible by road only through Canada, although there are car ferries which connect them to other Alaskan places.
Point Roberts, Washington is bounded by British Columbia, the Strait of Georgia, and Boundary Bay.
In Minnesota, Elm Point, two small pieces of land to its west (Buffalo Bay Point), and the Northwest Angle are bounded by the province of Manitoba and Lake of the Woods.
In Vermont, the Alburgh Tongue, as well as Province Point, which is the small end of a peninsula east of Alburgh, are bounded by Quebec and Lake Champlain.