en esa área

in that area

→ en
phrase Rare #40,669
in that area Can refer either to a physical area or to a field of study, work, or expertise. Although área is feminine, it uses the feminine demonstrative esa: en esa área.
SP: Mi hermana tiene mucha experiencia en esa área.
EN: My sister has a lot of experience in that area.

Tengo una amiga que trabaja en esa área.

I have a friend who works in that area.

— Audition (2000)

Es arriesgado que entres solo en esa área.

It's risky to go into that area alone.

Me preguntó si tenía experiencia en esa área, y le dije que no.

He asked me if I had experience in that area, and I told him no.

No entres en esa área.

Don’t enter that area.

Tom es una autoridad en esa área.

Tom is an authority in that area.