der See
lake
A large, standing body of water in a depression on the land surface, surrounded by land.
Im Sommer fahren wir oft zum Schwimmen an den See.
In summer, we often go to the lake to swim.

lake
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lake
A large, standing body of water in a depression on the land surface, surrounded by land.
Im Sommer fahren wir oft zum Schwimmen an den See.
In summer, we often go to the lake to swim.

The word 'See' has a completely different meaning depending on the article. 'Der See' (masculine) is an inland body of water, like a lake in the mountains. 'Die See' (feminine) means the sea or the oceans.
Der Chiemsee ist der größte See in Bayern.
Lake Chiemsee is the largest lake in Bavaria.
To describe a location at the lake, you use 'am See' (at the lake) with dative. To express movement toward it, you use 'an den See' (to the lake) with accusative.
Wir treffen uns am See.
We're meeting at the lake.
The word 'See' is often the second part of proper names for lakes or of compound nouns. This can often help you recognize that it refers to a lake.
Der Bodensee grenzt an Deutschland, Österreich und die Schweiz.
Lake Constance borders Germany, Austria, and Switzerland.
sea
'der See' and 'das Meer' are both large bodies of water, but they are not the same thing. 'Der See' is located on land and is surrounded by land, for example a swimming lake. 'Das Meer' is the large body of salt water that surrounds countries and continents. Learners often confuse the words because both can be places for swimming or travel. Also pay attention to the article: 'der See' is a lake inland, while 'das Meer' is the sea or coastal region with salt water.

Am Wochenende fahren wir an den See und schwimmen dort.
At the weekend, we are going to the lake and will swim there.
Im Sommer macht Sofia Urlaub am Meer.
In summer, Sofia goes on vacation by the sea.