der Waldsee
forest lake
A lake that is located in a forest or directly surrounded by forest.
An heißen Sommertagen fahren wir gerne zum abgelegenen Waldsee zum Schwimmen.
On hot summer days, we like to drive to the secluded forest lake to swim.

forest lake
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forest lake
A lake that is located in a forest or directly surrounded by forest.
An heißen Sommertagen fahren wir gerne zum abgelegenen Waldsee zum Schwimmen.
On hot summer days, we like to drive to the secluded forest lake to swim.

The word is very transparently made up of 'der Wald' (forest) and 'der See' (lake). So it simply refers to a lake located in the forest.
Der Weg zum Waldsee ist nicht leicht zu finden.
The path to the forest lake is not easy to find.
Pay attention to the prepositions: You are 'am' Waldsee (at the forest lake, on the shore), but you swim 'im' Waldsee (in the forest lake, in the water). If you are moving toward it, you say 'an den' Waldsee fahren (to drive to the forest lake).
Wir haben den ganzen Nachmittag am Waldsee gelegen und gelesen.
We lay by the forest lake all afternoon and read.
A forest lake is often described positively and as close to nature. Common adjectives are 'idyllisch' (idyllic), 'abgelegen' (secluded), 'ruhig' (quiet), or 'versteckt' (hidden).
Hinter den Hügeln liegt ein kleiner, idyllischer Waldsee.
Behind the hills lies a small, idyllic forest lake.
lake
'der See' and 'der Waldsee' both mean a standing body of water surrounded by land. 'der See' is the general word and says nothing about the surroundings. A lake can be in the city, in the mountains, or in the countryside. 'der Waldsee' is more specific: it is located in a forest or directly surrounded by forest. Learners may confuse the words because a forest lake is also a lake. If the location in the forest is important, 'Waldsee' fits. If it is only about the water itself, 'See' is enough.

Nach einer langen Wanderung machten wir Pause an einem stillen Waldsee.
After a long hike, we took a break at a quiet forest lake.
Im Sommer schwimmen viele Familien in dem See am Stadtrand.
In summer, many families swim in the lake on the outskirts of town.