La sucursal de correos está en las afueras.

Spanish uses estar for physical location, so está is the normal choice here.

• La sucursal de correos está en las afueras. = it is located on the outskirts.
• Using es would sound wrong for location in this sentence.

A useful rule of thumb is:

• ser = what something is
• estar = where something is / how something is

So for location, Spanish usually prefers estar.

Sucursal means branch or branch office.

So la sucursal de correos is not just any mail-related place in general; it specifically suggests a branch post office or postal branch.

You will also see sucursal with banks, stores, and companies:

• la sucursal del banco = the bank branch
• una sucursal de la tienda = a branch of the store

Because the main noun is sucursal, and sucursal is feminine.

In la sucursal de correos, the article must match sucursal, not correos.

So:

• la sucursal = correct
• el sucursal = incorrect

This is a common point for English speakers, because English does not mark nouns as masculine or feminine.

De correos is a standard way to refer to the postal service or post office system.

In many varieties of Spanish, correos can refer to the mail service or postal service, often as an institution. So sucursal de correos means something like postal branch office.

Why not del correo?

• correo often means mail, post, or email, depending on context.
• correos in this kind of expression sounds more like the official postal service.

So de correos is the natural phrasing here.

En las afueras means on the outskirts or outside the central part of a town or city.

It suggests a place that is:

• not downtown
• not in the center
• toward the outer edges of the urban area

It does not usually mean completely in the countryside, although it can be near that area.

Because las afueras is a fixed expression in Spanish.

Spanish normally uses it in the plural:

• en las afueras = on the outskirts
• a las afueras de la ciudad = on the outskirts of the city

You generally would not say en la afuera here.

Think of it as a set phrase you learn as a whole: las afueras.

With estar, en is the normal preposition for location:

• Está en las afueras. = It is on the outskirts.

You often use a with movement toward a destination:

• Vamos a las afueras. = We’re going to the outskirts.

So the difference is often:

• en = location
• a = movement toward

That said, in real Spanish you may sometimes hear a las afueras de... in location-type expressions too, but for learners, está en las afueras is the safest and clearest pattern.

Not necessarily. En las afueras can stand on its own if the place is understood from context.

For example, if everyone already knows you are talking about a certain town, then:

• La sucursal de correos está en las afueras.

is perfectly natural.

If you want to be more specific, you can add the place:

• La sucursal de correos está en las afueras de la ciudad.

So both are possible. The shorter version just leaves the city or town implied.

Yes, but the meaning shifts a little.

• la oficina de correos = the post office
• la sucursal de correos = the branch post office / postal branch

So oficina is more general, while sucursal emphasizes that it is one branch of a larger system.

If the original sentence specifically says sucursal, it is pointing to that idea of a branch location.

Because las afueras is normally used with the article as part of the fixed expression.

Spanish often uses articles in places where English may not think of them the same way. Here, the natural phrase is:

• en las afueras

not usually just:

• en afueras

So it is best to memorize the whole phrase together.

A simple Latin American-style pronunciation guide would be:

la soo-koor-SAHL deh koh-RREH-os es-TAH en las ah-FWEH-rahs

A few helpful notes:

• sucursal is stressed on the last syllable: -sal
• correos has the stress on re: co-RRE-os
• está is stressed on the second syllable because of the accent mark
• In many Latin American accents, the rr in correos is a strong rolled or tapped sound

Yes. Spanish word order is somewhat flexible, although the original version is very natural.

These are all possible depending on emphasis:

• La sucursal de correos está en las afueras.
• En las afueras está la sucursal de correos.

The first one is the most neutral and most likely for learners to use.

The second one puts more emphasis on where it is.