On the island of Lindau in the eastern Lake Constance is the Altstadt of the Bavarian county town of Lindau, which occupies the eastern part of the island. The island of Lindau, which forms 2% of the area and 12% of the population of the entire town, is one of the town's ten administrative districts. The district is just called Insel ("Island").

Lake Constance refers to three bodies of water on the Rhine at the northern foot of the Alps: Upper Lake Constance (Obersee), Lower Lake Constance (Untersee), and a connecting stretch of the Rhine, called the Lake Rhine (Seerhein). These waterbodies lie within the Lake Constance Basin in the Alpine Foreland through which the Rhine flows.