Montérolier (French pronunciation: [mɔ̃teʁɔlje]) is a commune in the Seine-Maritime department in the Normandy region in northern France.

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Montérolier
Commune
Montérolier-Buchy railway station
Coat of arms
Location of Montérolier
Montérolier Show map of France Montérolier Show map of Normandy
Coordinates: 49°37′48″N 1°20′49″E
Country	France
Region	Normandy
Department	Seine-Maritime
Arrondissement	Dieppe
Canton	Neufchâtel-en-Bray
Intercommunality	CC Bray-Eawy
Government
• Mayor (2020–2026)	Hervé Hunkeler[1]
Area 1	11.7 km2 (4.5 sq mi)
Population  (2021)[2]	614
• Density	52/km2 (140/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	76445 /76680
Elevation	132–212 m (433–696 ft) (avg. 146 m or 479 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

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A farming village situated in the Pays de Bray, some 30 miles (48 km) southeast of Dieppe at the junction of the D24 and the D38 roads. The river Varenne has its source here. Montérolier-Buchy station has rail connections to Rouen, Lille and Amiens.

Surrounded by the communes Neufbosc, Mathonville and Saint-Martin-Osmonville, Montérolier is located 26 km northeast of Mont-Saint-Aignan, the largest city nearby.

During 1943, in the Clairefeuille woods at Montérolier, the Germans built underground galleries in which to store V-1 flying bombs. After the Second World War, the galleries were opened to the public. On the 21 and 22 June 1995, 13 people died accidentally in the tunnels.

• The church of Notre-Dame, dating from the eighteenth century.
• Traces of an 11th-century castle.
• A nineteenth-century château.
• A sandstone cross, from the sixteenth century.
• The tunnels of Montérolier. (Closed since the accident in 1995).

• Jean de Grouchy, sieur of Montérolier (1354–1435).

• Communes of the Seine-Maritime department