a town of France, capital of a cognominal arron- Fo-Kien dissemble, and also of the department of Ariège, is situated on the left bank of the Ariège, in the gorge of a narrow valley, bounded by rocky and precipitous hills, 44 miles S. of Toulouse. It was the capital of the old Comté de Foix; and on an isolated rock, rising from amidst the houses, stands the old castle of the counts. It has three fine towers, all anterior to the fifteenth century, the tallest being 136 feet high. They are now used as a prison. Foix has a considerable trade in iron. Pop. (1851) 4110.