Vallée de l'Orne et ses affluents translated as Orne Valley and tributaries is a Natura 2000 conservation area that is 2,115 hectares in size.
[1] The area is focused on Orne and 3 of its main tributaries, the laize, the Noireau and the Rouvre, as they flow through the different landscapes of Norman Switzerland.
[2] These landscapes range from deep gorges, torrential or slow-flowing rivers, wet meadows, alluvial forests, escarpments, scree slopes, siliceous ledges, enclosed woods and hedgerows.
[3] It is spread across 21 different communes all within the departments of Orne and calvados;[2]
The conservation area has seventeen species listed in Annex 2 of the Habitats Directive;[4] In addition the Natura 2000 site has eighteen habitats protected under the Habitats Directive.