large sea-port town of Picardy in France, and capital of the Boulognois, now called the department of the Straits of Calais, with a harbour, and formerly a bishop's see. It is divided into two towns; the higher, and the lower. The former is strong both by nature and art; and the latter is only surrounded with a single wall. The harbour has a mole for the safety of shipping, which at the same time prevents it from being choked up. The lower town is inhabited by merchants, and has three large streets, one of which leads to the high town, and the other two run in a line on the side of the river. It is situated at the mouth of the river Lianne, and 14 miles south of Calais. E. Long. 1° 42'. N. Lat. 50° 42'.