How to Say "seaside" in Spanish
The Spanish word for “seaside” is “costa” — A1 level. This is a very common word in everyday Spanish.

Examples
Pasaremos nuestras vacaciones en la costa del Mediterráneo.
We will spend our vacation on the Mediterranean coast.
La costa de ese país es muy rocosa y difícil de navegar.
The shore of that country is very rocky and difficult to navigate.
Hay pueblos pequeños y bonitos a lo largo de toda la costa.
There are beautiful small towns all along the entire coast.
Gender Reminder
Even though 'costa' ends in -a, always remember that it is a feminine noun and needs 'la' or 'una'.
Confusing 'costa' and 'costado'
Mistake: “Using 'el costado' when talking about the beach.”
Correction: 'Costado' means 'side' (of a person or object), while 'costa' is only the land next to the sea.
Related Translations
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