Clairmarais (French pronunciation: [klɛʁmaʁɛ]; West Flemish: Klaarmares) is a commune in the Pas-de-Calais department in the Hauts-de-France region of France.^[3]

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Clairmarais Klaarmares
Commune
Romelaëre nature reserve
Coat of arms
Location of Clairmarais
Clairmarais Show map of France Clairmarais Show map of Hauts-de-France
Coordinates: 50°46′27″N 2°18′03″E
Country	France
Region	Hauts-de-France
Department	Pas-de-Calais
Arrondissement	Saint-Omer
Canton	Saint-Omer
Intercommunality	Pays de Saint-Omer
Government
• Mayor (2020–2026)	Damien Morel[1]
Area 1	18.02 km2 (6.96 sq mi)
Population  (2021)[2]	587
• Density	33/km2 (84/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	62225 /62500
Elevation	1–34 m (3.3–111.5 ft) (avg. 9 m or 30 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 reclaimed marshland, 2 miles (3 km) northeast of Saint-Omer, on the D209 road. The Neufosse Canal, which connects the rivers Aa and Lys, passes by the commune.

It owes its origin to the famous Cistercian abbey founded by St. Bernard in 1140. He gave the village the name of Claromarisco (later to be Clarus Mariscus and then Clermarez) because of the huge marshes and many rivers in the vicinity. The Dutch Klaarmares and West Flemish Cleremeersch names reflect the nature of the terrain, too.
Clairmarais became a fully-fledged common in 1790 when the abbey was going to be destroyed and sold as a national asset during the French Revolution.

During World War I, the Royal Flying Corps, and later Royal Air Force, operated from Clairmarais aerodrome.^[5]

• The church of St. Bernard, dating from the nineteenth century.
• A windmill.
• Vestiges of the 13th century abbey including the remains of the entrance to the abbey with gatehouse buildings, a chapel and dovecote.
• The eighteenth century Cistercian farm of Cloquette.
• The cave of Notre-Dame de Lourdes which is host to a pilgrimage on August 15. It is the largest in France, north of the Seine.
• The Romelaëre national nature reserve.^[6]

• Communes of the Pas-de-Calais department