Rheinsee
Germany · Europe
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The Untersee (German pronunciation: [ˈʊntɐzeː], lit. 'Lower Lake'), also known as Lower Lake Constance, is the smaller of the two lakes that together form Lake Constance. The boundary between Switzerland and Germany runs through it. The lake surrounds several islands, the largest being Reichenau Island.
Adapted from Wikipedia (CC BY-SA)。Photography via Wikimedia Commons.