Untersee (Lake Constance) in the context of "Stein am Rhein"

The Obersee (German pronunciation: [ˈoːbɐzeː] , lit. 'Upper Lake'), also known as Upper Lake Constance, is the much larger of the two parts of Lake Constance, the other part being the Untersee (English: Lower Lake). The two parts are separated by the Bodanrück peninsula. The narrow, northwestern branch of Obersee is also called Überlinger See (English: Lake Überlingen).

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.

Reichenau Island (German: [ˈʁaɪçənaʊ] ) is an island in Lake Constance in Southern Germany. It lies almost due west of the city of Konstanz, between the Gnadensee and the Untersee, two parts of Lake Constance. With a total land surface of 4.3 km (1.7 sq mi) and a circumference of 11 km (6.8 mi), the island is 4.5 km (2.8 mi) long and 1.5 km (0.93 mi) wide at its greatest extent. The highest point, the Hochwart, stands some 43 m (141 ft) above the lake surface and 438.7 m (1,439 ft) above mean sea level.

Reichenau is connected to the mainland by a causeway, completed in 1838, which is intersected between the ruins of Schopflen Castle and the eastern end of Reichenau Island by a 10-metre-wide (33 ft) and 95-metre-long (312 ft) waterway, the Bruckgraben. A low road bridge allows the passage of ordinary boats but not of sailing-boats.

The Schweizerische Schifffahrtsgesellschaft Untersee und Rhein AG (commonly abbreviated to URh), lit. 'Swiss Navigation Company of the Untersee and Rhine', is an Aktiengesellschaft (AG) based in the Swiss town of Schaffhausen. It operates regular boat lines (spring–autumn) between Schaffhausen and Kreuzlingen over the scenic High Rhine (Hochrhein) and western part of Lake Constance (Bodensee).

The company was founded in 1850 as the Schweizerische Dampfboot-Aktiengesellschaft (Swiss paddle steamer corporation). After stopping all operations in 1863, it resumed operations in 1864 under its new name Schweizerische Dampfbootgesellschaft für den Untersee und Rhein (lit. 'Swiss paddle steamer association for the Untersee and Rhine'). The company runs under its current name since 1936.