Saint-Omer (Sint-Omaars in Dutch), a town and commune of Artois in northern France, sous-préfecture of the Pas-de-Calais département, 68 km (42 mi) westnorthwest of Lille on the railway to Calais. The town is named after Saint Audomare (Omer) (d. ca. 670 AD), who brought Christianity to the area.
The canalised portion of the river Aa begins at Saint-Omer, reaching the North Sea at Gravelines. Below its walls, the Aa connects with the Neufossé canal, which ends at the Lys.
Source: CIA Factbook, Wikipedia
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