sea

US /siː/
UK /siː/
"sea" picture
1.

mar

the expanse of salt water that covers most of the earth's surface and surrounds its landmasses

:
The ship sailed across the vast sea.
El barco navegó a través del vasto mar.
We spent our vacation by the sea.
Pasamos nuestras vacaciones junto al mar.
2.

mar, lago

a large area of fresh water; a lake

:
The Caspian Sea is actually the world's largest inland body of water.
El mar Caspio es en realidad el cuerpo de agua interior más grande del mundo.
They sailed their small boat on the Dead Sea.
Navegaron en su pequeña embarcación por el mar Muerto.
3.

mar, gran cantidad

a large amount or number of something

:
There was a sea of faces in the crowd.
Había un mar de caras en la multitud.
He inherited a sea of troubles from his predecessor.
Heredó un mar de problemas de su predecesor.