Triboldingerbohl, also known as Triboltingen or großes Bohl or Langenrain, is the fourth largest island of Lake Constance, with an area of 0.13557 km². It is 780 meters long and up to 230 meters wide. It is located in the easternmost part of the Untersee (Lake Constance), near the point where the Seerhein flows into the lake. This part of the lake is also known as the Rheinsee. 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 2.1 km southeast of Reichenau Island and 1.6 km 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.
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