The Pas-de-Calais is a department in northern France named after the French designation of the Strait of Dover, which it borders. It has the most communes of all the departments of France, with 887, and is the 8th most populous. It had a population of 1,457,905 in 2023. The Calais Passage connects to the Port of Calais on the English Channel. The Pas-de-Calais borders the departments of Nord and Somme and is connected to the English county of Kent via the Channel Tunnel.