Untersee is the High Rhine with the Rhine Falls at Schaffhausen. Both the average precipitation of 0.45 km³/a and evaporation which averages 0.29 km³/a cause a net change in the level of Lake Constance that is less when compared to the influence of the inflows and outflows. Further quantities of lake water are extracted by municipal waterworks around the lake and the water company of Bodensee-Wasserversorgung. Islands In Lake Constance there are ten islands that are larger than . By far the largest is the island of Reichenau in the Untersee, which belongs to the municipality of Reichenau. The former abbey of Reichenau is a UNESCO World Heritage Site due to its three early and highly medieval churches. The island is also known for its intensive cultivation of fruit and vegetables. The island of Lindau is located in the east of the Obersee, and is the second largest island. On it is the old town and main railway station of Lindau. The third largest island is Mainau in the southeast of Lake Überlingen. The owners, the family of Bernadotte, have set up the island as a tourist attraction and created botanical gardens and wildlife enclosures. Relatively large, but uninhabited and inaccessible because of their status as nature reserves, are two islands off the Wollmatinger Ried: the Triboldingerbohl which has an area of and Mittler or Langbohl which is just in area. Smaller islands in the Obersee are: Dominican Island (Dominikanerinsel) separated by a six-metre-wide ditch from the old town of Constance which is home to the Steigenberger Hotel () The tiny island of Hoy near Lindau The ten artificial islands on the Rhine Causeway on the Fußach side The little island by the port of Romanshorn The Wollschweininsel (officially Wulesaueninsle) by the Seepark in Kreuzlingen In the Untersee are: the islands of Werd, Mittleres Werdli and Unteres Werdli which together form the Werd Islands group are located at the outflow of the Rhine from the Untersee at Stein am Rhein into the High Rhine. The so-called Liebesinsel ("Love Island", , southwest of the Mettnau peninsula. Peninsulas In Lake Constance there are several peninsulas which vary greatly in size: The Bodanrück, the largest peninsula, separates the Überlinger See (Obersee) from the Untersee. It covers an area of . The Mettnau in the Untersee, which extends towards the Island of Reichenau, separates Zeller See in the south from the Markelfinger Winkel in