A natural summer playground, the Bodensee (Lake Constance) is ringed with little towns and busy resorts. Lapping the shores of Germany, Switzerland, and Austria, the Bodensee, at 65 km (40 miles) long and 15 km (9 miles) wide, is the largest lake in the German-speaking world.

Though called a lake, it's actually a vast swelling of the Rhine, gouged out by a massive glacier in the Ice Age and flooded by the river as the ice receded. The Rhine flows into its southeast corner, where Switzerland and Austria meet, and flows out at its west end. On the German side, the Bodensee is bordered almost entirely by the state of Baden-Württemberg (a small portion of the eastern tip, from Lindau to Nonnenhorn, belongs to Bavaria).

It's one of the warmest areas of the country, not just because of its southern latitude but also owing to the warming influence of the water, which gathers heat in summer and releases it in winter. The lake itself practically never freezes over—it has done so only once in the past two centuries. The climate is excellent for growing fruit, and along the roads you'll find stands and shops selling apples, peaches, strawberries, jams, juices, wines, and schnapps, much of it homemade.