antaŭurbo

Decode it and you have it. Antaŭ is before, in front of. Urbo is the town. An antaŭurbo is the fore-town: the part you reach before you get to the town proper. That is exactly how German builds Vorstadt, and it is a slightly different picture from English, where the Latin sub- puts the suburb below the city rather than in front of it. Neither is a claim about geography; both are the same idea of a settlement attached to a bigger one.

Head-final, like every Esperanto compound. The last root is the thing, the earlier ones say which kind. An antaŭurbo is a kind of urbo, just as mondmilito is a kind of milito and antaŭurba trajno is a suburban train. Compound words as a system are covered in the compounding article, including when the linking -o- earns its keep - here it does not, because antaŭurbo is perfectly pronounceable without one.

The antaŭ- family is large and worth collecting. Antaŭtago the day before, antaŭvidi to foresee, antaŭjuĝo a prejudice (a judgement made in front of the evidence), antaŭnomo a first name, antaŭĉambro an anteroom. The preposition also builds the time words at the other end of this band: postmorgaŭ is the day after tomorrow and antaŭhieraŭ the day before yesterday.

Suburb, not countryside. Keep it apart from kamparo, which is open country, and from ĉirkaŭaĵo, the surroundings of a place. Antaŭurbo is built-up and belongs to the city it hangs off; antaŭurbano is the person who lives there.