Triboldingerbohl
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Triboldingerbohl, also known as Triboltingen or großes Bohl or Langenrain, is the fourth largest island of Lake Constance, with an area of . It is long and up to wide. It is located in the easternmost part of the
Untersee (Lake Constance) The Untersee (German for ''Lower Lake''), also known as Lower Lake Constance, is the smaller of the two lakes that together form Lake Constance and forms part of the boundary between Switzerland and Germany. Geography The Lower Lake Consta ...
, near the point where the Seerhein flows into the lake. This part of the lake is also known as the
Rheinsee {{infobox body of water , name = Rheinsee , image = Ermatingen.jpg , caption = View of the Rheinsee near Ermatingen , location = Baden-Württemberg , coordinates = {{coord, 47, 39, 45, N, 08, 57, 37, E, type:landmark_region:DE-BW, format=dms, d ...
. It belongs to the Wollmatinger Ried nature conservation area; administratively it belongs to the district ''industrial area'' of the City of Constance. Until 1934, it belonged to the municipality of Wollmatingen, which was then annexed by Constance. Triboldingerbohl lies southeast of
Reichenau Island Reichenau Island () 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 and a circumference of ...
and from the dam that connects Reichenau to the mainland. The area between Triboldingerbohl island and the Reichenau dam is called ''Ermatinger pool'' and is an ecologically important shallow-water zone. Triboldingerbohl is uninhabited. It is a bird sanctuary. It takes its name from the former Swiss municipality Triboltingen, which was located on the southern shore of Lake Untersee. Between Triboldingerbohl and the mainland lies the smaller island of ''Mittler Bohl'', also known as ''Langbohl''. The two islands are separated by a channel which is only wide. This channel and the channel separating Langbohl from the mainland are collectively known as ("tubes"). Both island are covered with reeds. They consist of a several meters thick layer of ''Schnegglisand'', a calcareous deposits from
Blue-green algae Cyanobacteria (), also known as Cyanophyta, are a phylum of gram-negative bacteria that obtain energy via photosynthesis. The name ''cyanobacteria'' refers to their color (), which similarly forms the basis of cyanobacteria's common name, bl ...
), which is covered by a layer of humus. Although the island is uninhabited, it is listed in the Constance street directory. It falls under postal code 78467 (Constance-Wollmatingen).Street directory: Triboldingerbohl (Island)
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Footnotes

Uninhabited islands of Germany Islands of Lake Constance in Germany Landforms of Baden-Württemberg {{BadenWürttemberg-geo-stub