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Tiny Point Roberts, Wash., is built on a finger of land that extends south of the 49th parallel into Boundary Bay. This means that, though it’s part of the mainland United States, it can be reached by land only by traveling through Canada.

Similarly, Minnesota’s Northwest Angle extends from Manitoba into the Lake of the Woods, and Alburgh, Vt., resides on a peninsula that extends south from Quebec into Lake Champlain.

None of these places are islands; all are part of the 48 contiguous states but are not directly connected to them by land. Among other things, this makes life difficult for students in Point Roberts, whose primary school offers classes only through third grade. From fourth grade on, students must take a 40-minute bus ride through British Columbia to attend classes in Blaine, Wash.