Grenen in Skagen (Denmark)

Appropriately enough for such a neat and ordered country, Denmark doesn’t end untidily at its most northerly point, but on a neat finger of sand just a few metres wide. You can actually paddle at its tip, where the waters of the Kattegat (an arm of the Baltic Sea) and Skagerrak (part of the North Sea) clash, and you can put one foot in each sea – but not too far. Bathing here is forbidden because of the ferocious tidal currents.