"Fata este în spatele casei."

Translation: The girl is behind the house.

[Ainar-G]

Why not "in the back of the house"?

[JohnGardne7]

I used "in back of the house," then requested that it be accepted.

[Wes708337]

"in the back of the house" says she is in a room in the back part of the house. "In back of the house" means she is outside, behind the house.