Pontarlier is a city of 20,000 inhabitants (Pontissaliens), sous-préfecture of the department of Doubs.
Pontarlier (pont means in French "bridge") is located on the river Doubs (in Latin Dubius, "dubious", because of its complicated course) close to the border with Switzerland.
Pontarlier was definitively incorporated to France in 1678 by the Treaty of Nijmegen.