Nismes Castle – Eau Noire River in Nismes loop from Olloy-sur-Viroin

Routes

Hiking trails & Routes

Nismes Castle – Eau Noire River in Nismes loop from Olloy-sur-Viroin

Hard

4.8

(12)

hikers

Nismes Castle – Eau Noire River in Nismes loop from Olloy-sur-Viroin

05:37

20.0km

390m

Hiking

Hard hike. Very good fitness required. Easily walkable paths. The starting point of the route is accessible with public transport.

Last updated: August 9, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Fondry des Chiens

Parc national de l’Entre-Sambre-et-Meuse

Parc naturel Viroin Hermeton

Waypoints

Start point

Train Station

Get Directions

3.00 km

Dourbes Tunnel

Highlight • Structure

Known on the map as "Tunnel des Dourbes". Where Dourbes refers to the Réserve naturelle de Dourbes". On the mountainside that you can climb with some beautiful steps you also …

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5.06 km

Les Abannets

Nature Reserve

5.73 km

Nismes Castle

Highlight • Castle

5.89 km

Moulin Guillaume

Highlight • Monument

This water mill, located downstream of the 'Zwarte Water' and below the Mousty mountain, was mentioned in 1609 as a ban mill: the local residents were obliged to have their …

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6.28 km

Viewpoint "Pont d'Avignon"

Highlight • Viewpoint

Here in the arboretum of Nismes there is an official viewpoint above the Pont d'Avignon, where you can look out over Nismes, its church and the castle.

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6.41 km

Mousty Arboretum

Highlight • Forest

The Mousty arboretum was planted in the last century by a forestry engineer who wanted to test different tree species for the limestone region. Today you can admire more than …

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6.44 km

View of the Forest and Rocky Outcrop

Highlight • Viewpoint

9.65 km

Grottes de Neptune

Cave Entrance

13.1 km

Eau Noire River in Nismes

Highlight • River

The Eau Noire is a source river of the Viroin that rises at Cul-des-Sarts in the extreme south of the province of Namur at an altitude of 350 meters. Shortly …

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14.1 km

Fondry des Chiens

Nature Reserve

17.5 km

Viroin

Lake

18.5 km

View of the Viroin Valley

Highlight • Viewpoint

Actually, you are here in the "Réserve naturelle de Dourbes". A beautiful nature reserve located in the valley of the Eau Blanche and the Eau Noire. The area is known …

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20.0 km

End point

Train Station

Way Types & Surfaces

Way Types