das Meer
sea
The large, connected body of salt water that covers a large part of the Earth's surface.
Im Urlaub fahren wir jedes Jahr ans Meer.
On vacation, we go to the sea every year.

sea
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sea
The large, connected body of salt water that covers a large part of the Earth's surface.
Im Urlaub fahren wir jedes Jahr ans Meer.
On vacation, we go to the sea every year.

The word element 'Meer-' (sea) is a very productive part of many compound nouns that have to do with the sea. If you see 'Meer-' at the beginning of a word, it probably has to do with the ocean.
Der Meeresspiegel steigt aufgrund des Klimawandels an.
Sea level is rising due to climate change.
Pay attention to the prepositions: You go 'ans Meer' (to the sea; direction, accusative), you are 'am Meer' (by/at the sea; location, dative), and you swim 'im Meer' (in the sea; in the water, dative).
Wir fahren nächste Woche für ein paar Tage ans Meer.
We're going to the sea for a few days next week.
In the figurative meaning, 'Meer' (sea) is almost always used in the structure 'ein Meer von + plural noun' (a sea of + plural noun). It describes a huge, overwhelming amount.
Die Band spielte vor einem Meer von begeisterten Fans.
The band played in front of a sea of enthusiastic fans.
country / countryside / land
'das Land' and 'das Meer' are simple opposites. 'Land' means solid ground. 'Meer' means the large body of salt water. This contrast is especially typical with coasts, islands, ships, and travel. You can be at sea and later go back onto land. In this contrast, 'Land' does not mean a country, but solid ground.

Im Urlaub sitzt Sofia jeden Morgen am Meer und liest.
On vacation, Sofia sits by the sea every morning and reads.
Vom Schiff aus sahen wir am Abend endlich wieder Land.
From the ship, we finally saw land again in the evening.