The arrondissement of Mont-de-Marsan is an arrondissement of France in the Landes départment in the Aquitaine region. It has 178 communes. Its surface area of over 6,000 km² is the largest of any arrondissement in Metropolitan France, its size being comparable to an entire département such as the Eure.
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Coordinates 43°53'28.074" N -0°30'3.5" E
