
das Gewässer
body of water
A general term for a collection of water on the Earth's surface, such as a lake, river, pond, or sea.
Der Bodensee ist das größte Gewässer in Deutschland.
Lake Constance is the largest body of water in Germany.
body of water
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body of water
A general term for a collection of water on the Earth's surface, such as a lake, river, pond, or sea.
Der Bodensee ist das größte Gewässer in Deutschland.
Lake Constance is the largest body of water in Germany.

to fish in foreign waters
An idiom meaning to interfere in other people's affairs or to become active in an area for which one is not responsible.
Mit seinen Vorschlägen für die Marketingabteilung fischt der Kollege aus der Buchhaltung in fremden Gewässern.
With his suggestions for the marketing department, the colleague from accounting is fishing in foreign waters.
The word 'Gewässer' (body of water) is a collective term derived from the word 'Wasser' (water) with the prefix 'Ge-'. This prefix is often used to describe a collection or totality of something, as also in 'Berg' (mountain) and 'Gebirge' (mountain range).
Die Wasserqualität der deutschen Gewässer hat sich verbessert.
The water quality of German bodies of water has improved.
Common distinctions are 'fließende Gewässer' (flowing bodies of water) for rivers and streams and 'stehende Gewässer' (standing/still bodies of water) for lakes and ponds. People also speak of 'Binnengewässern' (inland waters) when they are located inland.
Fließende Gewässer sind ein wichtiger Lebensraum für viele Fischarten.
Flowing bodies of water are an important habitat for many fish species.
The idiom 'in fremden Gewässern fischen' (to fish in foreign waters) is a fixed unit. The verb 'fischen' (to fish) is conjugated, while the rest of the expression remains unchanged.
Er sollte sich auf seine eigene Arbeit konzentrieren und nicht in fremden Gewässern fischen.
He should concentrate on his own work and not fish in foreign waters.
water
When referring to a lake or river, “das Wasser” can mean either the liquid or the body of water. “Das Gewässer,” by contrast, refers to the geographical body of water as a whole. When talking about pollution, the choice therefore depends on whether you mean the substance or the entire lake or river.

Nach dem Unfall wird das gesamte Gewässer auf Verschmutzung untersucht.
After the accident, the entire body of water is tested for contamination.
Nach dem Unfall ist das Wasser im See mit Öl verschmutzt.
After the accident, the water in the lake is contaminated with oil.