An infographic map displaying the lengths of France's land borders in kilometers. The main map of metropolitan France shows the following border lengths: Spain: 623 km Andorra: 57 km Monaco: 4 km Italy: 515 km Switzerland: 573 km Germany: 448 km Luxembourg: 73 km Belgium: 659 km Two inset maps on the left show the borders of overseas territories: The border with the Netherlands on the island of Saint Martin is 13 km. The borders of French Guiana are 520 km with Suriname and 730 km with Brazil.