The two most extensive, Lake Geneva and Lake Constance, are amongst the largest in Europe and mark the border of the Swiss Plateau, along with the Alps and the Jura Mountains.

Several major lakes are located on the borders between Switzerland and its neighbors, but the most famous is Lake Geneva (known in French as Lac Léman), which marks the southwestern border with France. Roughly 60% of the lake belongs to Switzerland and 40% to France. Another massive border lake is Lake Constance (Bodensee), situated in the northeast where Germany, Switzerland, and Austria meet; interestingly, there are no formal legal borders drawn through the center of Lake Constance, as the three countries manage it as a "condominium." To the south, you will find Lake Maggiore and Lake Lugano, both of which are shared between Switzerland (Canton of Ticino) and Italy. These lakes are not just natural boundaries but vital economic and cultural hubs in 2026, supporting thriving international ferry networks and lakeside towns such as Geneva, Évian-les-Bains, Bregenz, and Lugano. Each lake offers a unique blend of cultures, with Lake Geneva feeling distinctly Francophone and the southern lakes offering a Mediterranean-Swiss "Dolce Vita" atmosphere.