Calais (UK: /ˈkæleɪ/ KAL-ay, US: /kæˈleɪ/ kal-AY, traditionally /ˈkælɪs/ KAL-iss, French: [kalɛ] ) is a French major port city in the Pas-de-Calais department, of which it is a subprefecture. Calais is the largest city in Pas-de-Calais. The population of the city proper is 67,544; that of the urban area is 144,625 (2020). Calais overlooks the Strait of Dover, the narrowest point in the English Channel, which is only 34 km (21 mi) wide here, and is the closest French town to England. The White Cliffs of Dover can easily be seen from Calais on a clear day. Calais is a major port for ferries between France and England, and since 1994, the Channel Tunnel has linked nearby Coquelles to Folkestone by rail.
Because of its position, Calais has been a major port and an important centre for transport and trading with England since the Middle Ages. Calais came under English control after Edward III of England captured the city in 1347, followed by a treaty in 1360 that formally assigned Calais to English rule. Calais grew into a thriving centre for wool production, and came to be called the "brightest jewel in the English crown" because of its importance as the gateway for the tin, lead, lace and wool trades (or "staples"). Calais remained under English control until its recapture by France in 1558.