L', an arrondissement in the department of the Ardèche, in France, extending over 716 square miles, or 458,240 acres, divided into 10 cantons, and again into 104 communes, with 84,909 inhabitants.—The capital of the arrondissement is a city of the same name. It is in a deep valley, in which silk-mills are turned by a stream that runs through it. It contains 390 houses and 1706 inhabitants.