Obersee (Lake Constance) in the context of Bodanrück

The border between the modern states of Austria and Switzerland is divided into two parts, separated by the Principality of Liechtenstein, with a total length of 180 km (110 mi). The longer, southern stretch runs across the Grison Alps and the shorter one following mostly the Alpine Rhine (which was straightened), except near Diepoldsau and between Lustenau and Lake Constance, where it follows the Old Rhine bed. The border continues northward to the Austrian-Swiss-German tripoint located within Upper Lake Constance.

The Seerhein (lit. 'Rhine of the lake(s)'; cf. Rheinsee) is a river about 4.3 km (2.7 mi) long, in the basin of Lake Constance (German: Bodensee). It is the outflow of the Upper Lake Constance and the main tributary of the Lower Lake Constance. The water level of the Lower Lake is about 30 cm (12 in) below the level of the Upper Lake. It is considered part of the river Rhine, which flows into Lake Constance as the Alpine Rhine and flows out of the Lower Lake as the High Rhine.

The Seerhein arose after the last ice age (the Würm glaciation, about 9650 BCE). Some time after this period, the water level of Lake Constance gradually dropped by about ten metres and the shallow parts fell dry. Some parts of the Seerhein still have a lake-like character.

The Mindelsee is a Proglacial lake in Radolfzell, Baden-Württemberg Germany. Its current area is approximately 115 hectares (280 acres) with an average depth of 8 metres (26 ft). it extends approximately 2,200 metres (1.4 mi) in a northwest-southeast direction with a width of around 570 metres (1,870 ft).

The lake is located on Bodanrück peninsula, which separates Upper Lake Constance from Lower Lake Constance.

The Leiblach is a 34-kilometre-long (21 mi) tributary of Lake Constance (Obersee) and the Rhine, respectively. It forms the Austria–Germany border near the lake.

Konstanz (/ˈkɒnstənts/ KON-stənts, US also /ˈkɔːnstɑːnts/ KAWN-stahnts, German: [ˈkɔnʃtants] or [ˈkɔnstants] , Alemannic German: [ˈkoʃd̥əts, ˈxoʃd̥əts]), traditionally known as Constance in English, is a university city with approximately 83,000 inhabitants located at the western end of Upper Lake Constance in the Baden-Württemberg state of south Germany. The city houses the University of Konstanz and was the residence of the Roman Catholic Diocese of Konstanz for more than 1,200 years.

Lake Überlingen (Standard German of Germany: Überlinger See, Swiss Standard German: Überlingersee) is the northwestern "finger" of the Obersee, the lower part of Lake Constance. The boundary of lake is defined as the ferry link from Meersburg to Constance. It extends north to Bodman-Ludwigshafen.

In contrast to the main south-eastern part of the Upper Lake, which is a condominium, Lake Überlingen is considered German territory.