Which federal state is Saarland?

EDITORIAL LEARNING AID

Why is this answer correct?

On the map for this question, Saarland carries the number 2; the small state lies in the south-west of Germany on the border with France and Luxembourg. The other numbers stand for other federal states and are therefore wrong.

Saarland: small, south-west, border with France.

This translation and explanation are editorial learning aids. The official German wording and answer key govern the examination.