Pas-de-Calais is a department in northern France that is named after the French word for the Strait of Dover, which it borders. It is named after that word. It has the most communes of any department in France, 890, and is the 8th most populated, so it has a lot of people there. The Calais Passage connects the Port of Calais on the English Channel to the Calais Passage on the French side. If you live in the department of Nord or Somme, you're in Pas-de-Calais. It's connected to the English county of Kent by the Channel Tunnel.