Once the Canadians, Nunavutians, Greenlanders and Danes all agree to ratify this, Hans Island will contain an international border 1.3 km in length between Canada and Greenland/Denmark.
Spain-Morocco should be on here. Ceuta and Melilla are not overseas territories, they're integral parts of the country. If you exclude them because they are disconnected from the rest of the country, by that logic the Turkey-Azerbaijan and Croatia-Montenegro borders shouldn't be here either.