L’Argilière de l’Aa

route de Bergues, 59143 Nieurlet

Formerly a clay quarry – clay being the raw material for the region’s roof tiles and bricks – this 16-hectare nature reserve in the Audomarois marshes features a lake that has naturally formed within the layers of clay. Nature has reclaimed the area, and it is the sheep – the site’s friendly caretakers – and the lovely rare plants that grow there that will brighten up your walk.

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Listing provided by Hauts-de-France Tourisme (updated by the source on 05/09/2023).

Tourist office data: DATAtourisme, Licence Ouverte (French open licence), updated 27 October 2026.