CHATEAUBRIANT, an arrondissement of the department of the Lower Loire, in France. It extends over 640 square miles, comprises seven cantons and thirty-seven communes, containing 49,666 inhabitants. The chief place, of the same name, is on the river Chère, and contains 650 houses, with 2733 inhabitants. Long. 1. 30. W. Lat. 47. 45. N.