AMBLETEUSE, a sea-port-town of France, in the department of the Straits of Calais, in the English Channel, twelve miles south-west from Calais, and eight north from Boulogne. At this port Cæsar embarked his cavalry when he invaded England; and James II. when he abdicated the crown landed. It is defended with a battery of cannon. E. Long. 1. 37. N. Lat. 50. 48.