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Mayenne is a landlocked department in northwest France named after the river Mayenne. Mayenne is part of the administrative region of Pays de la Loire and is surrounded by the departments of Manche, Orne, Sarthe, Maine-et-Loire, and Ille-et-Vilaine.
Mayenne is one of the original 83 departments created during the French Revolution on 4 March 1790. The northern two thirds correspond to the western part of the former province of Maine. The southern third of Mayenne corresponds to the northern portion of the old province of Anjou. The inhabitants of the department are called Mayennais.
The department does not have a sea coast, but about thirty kilometres to the northwest is Mont Saint-Michel Bay. The capital and largest town is Laval in the centre of the department. To the north lies the department of Orne, to the east lies Sarthe, to the south lies Maine-et-Loire, to the west lies Ille-et-Vilaine and to the northwest lies Manche. The department forms a roughly rectangular shape, being 90 km (56 mi) long by 77 km (48 mi) wide, with a total area of about 5,175 km2 (1,998 sq mi). The river Mayenne flows centrally through it from north to south, passing through the towns of Mayenne, Laval and Château-Gontier. After leaving the department, the river joins the river Sarthe to form the Maine which later joins the Loire.
The department is varied in topography. Much of it is largely flat, but there are also hilly areas, some with steep-sided valleys and ravines. Of the total area of 516,189 hectares (1,275,532 acres), some 354,000 hectares (875,000 acres) are arable, 69,000 hectares (170,000 acres) are grassland, 26,000 hectares (65,000 acres) are forests and woodland and 50,000 acres (20,200 ha) are heathland and moorland. To the north lies the Armorican Massif, a plateau that has been eroded over time, the highest summit of which, the Mont des Avaloirs, is the highest point in the department at 417 m (1,368 ft) above sea level. A branch range to the south of this plateau forms the ridge that divides the Mayenne Valley from the Vilaine Valley.