Boulogne-sur-mer, a city on the “Côte d’Opale”

Boulogne sur mer is situated at the mouth of the river Liane on the"Côte d'Opale".
The upper town (Ville Haute) commands splendid vistas of the harbour and lower town (Ville Basse).
Surrounded by ramparts and situated on the site of a Roman fortified camp,
the upper town is dominated by the dome of the Notre-Dame basilica.
The upper town contains important administrative as well as religious buildings,
and attracts lots of mostly British tourists all the year round.