50°26′24″N 2°34′26″E / 50.44°N 2.574°E The Arboretum d'Olhain (2 hectares) is an arboretum located in the Forêt Domaniale d'Olhain near Olhain, Fresnicourt-le-Dolmen, Pas-de-Calais, Nord-Pas-de-Calais, France. It is open daily without charge.
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