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The Sonian Forest (Forêt de Soignes) is a 4,421-hectare beech forest on Brussels' southeastern edge, partially inscribed as a UNESCO World Heritage Site for its outstanding cathedral-like stands of European beech.
Remnant of the vast ancient Silva Carbonaria forest. Managed as a hunting forest by the Dukes of Brabant since the 12th century. UNESCO-listed since 2017.