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L'identification de liaisons écologiques à l'échelle du territoire de la Wallonie contribue en outre à exécuter deux engagements de l'Union européenne, à savoir : enrayer la perte de biodiversité dans l'Union d'ici à 2020 et protéger, évaluer et rétablir la biodiversité et les services éco-systémiques dans l'Union d'ici à 2050. Cinq types de liaisons écologiques sont ainsi identifiés à l'échelle régionale afin de mettre en réseau les milieux naturels caractéristiques de grande valeur biologique: \u2022 les massifs forestiers feuillus, \u2022 les pelouses calcaires et les milieux associés, \u2022 les crêtes ardennaises, \u2022 les hautes vallées ardennaises, \u2022 les plaines alluviales typiques des larges vallées du réseau hydrographique.\nPour tout compléments d'information, consultez http://geoportail.wallonie.be/catalogue/07574b4f-65ec-4d70-90e1-533d4404d2f8.html", "geometryType": "esriGeometryPolyline", "sourceSpatialReference": { "wkid": 31370, "latestWkid": 31370, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -35872700, "falseY": -30622700, "xyUnits": 10000, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 }, "copyrightText": "SPW", "parentLayer": null, "subLayers": [], "minScale": 0, "maxScale": 0, "drawingInfo": { "renderer": { "type": "uniqueValue", 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