Guess the French region with the help of this clue: a gateway that survived despite friendly fire

In which of France's 13 regions was this photo taken?

Allied bombers accidentally struck this French town during World War Two

In World War Two, Allied bombers accidentally dropped bombs on the citadel of this French town, killing 100 people and destroying buildings. The gateway, which spans the Durance river, survived.

Can you guess where it is located?

Click to show answer
A) Sisteron (Alpes-de-Haute-Provence) in the region of Provence-Alpes-Côte d’Azur. The bridge is known as: the gateway to Provence.
An alternative view over the gateway