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Itterbeek Valley Wetlands – The Green Marsh loop from Opitter

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Hiking trails & Routes

Itterbeek Valley Wetlands – The Green Marsh loop from Opitter

Moderate

4.5

(62)

278

hikers

Itterbeek Valley Wetlands – The Green Marsh loop from Opitter

02:54

11.3km

40m

Hiking

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: August 17, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Nationaal Park Hoge Kempen

Kempen~Broek

Waypoints

Start point

Bus stop

Get Directions

49 m

Brouwerij Cornelissen

Highlight • Structure

Brouwerij Cornelissen (formerly Brouwerij Sint-Jozef) in Opitter is a family business. The exact date of foundation is not known, but the Vissers family, founders of the brewery, can be traced …

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228 m

Sint-Trudo Church Opitter

Highlight • Religious Site

The church is located near the Itterbeek and is surrounded by a walled cemetery. Originally this was a quarta capella, of which the patronage rights and the largest part of …

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339 m

Opitter Castle Park

Highlight (Segment) • Forest

Originally, a completely moated farm stood on the site of the castle. In 1899, this farm was sold to the unmarried Brussels lawyer De Greve, who also bought a number …

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2.32 km

Boardwalk Through the Wetlands

Highlight • Trail

A boardwalk leads across the moor. The water, however, isn't inviting for swimming.

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5.49 km

It is wonderful to walk in one of the most peaceful corners of Belgian nature. The valley, crossed by the meandering Itterbeek, offers a beautiful landscape of green meadows, forests and marshlands. Waterproof shoes are recommended!

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5.79 km

The Green Marsh

Highlight • Natural

This landscape offers a very special picture: trees in the water of the marsh landscape. A unique view to enjoy during your walk.

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6.27 km

Itterbeekvallei Nature Reserve

Highlight • Forest

The Itterbeekvallei is a beautiful nature reserve where grasslands, marshlands and dense shrubs together form a picturesque landscape. Along the winding stream you will find a rich biodiversity, with birds and colorful flowers that change with each season.

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11.0 km

Old Castle Mill

Highlight • Monument

One of the many watermills on the Itterbeek, here at the castle park. Undershot waterwheel in poor condition.

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11.3 km

End point

Bus stop

Way Types & Surfaces

Way Types

6.67 km

2.59 km

1.30 km

730 m

Surfaces

4.00 km

2.68 km

2.34 km

1.52 km

739 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Weather

Wednesday 26 August

31°C

16°C

28 %

Additional weather tips

Max wind speed: 14.0 km/h

to get more detailed weather forecasts along your route

Comments

January 31, 2026,Tussen moeras en nieuwsgierige paarden 🐎🌿

Today, Naomi and I went on our very first walk ever, starting from Opitter, in the marshlands of the Itterbeek Valley, also known as Het Groene Swaeras (The Green Marsh). It was a place we'd never been before, but it immediately surprised us.

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August 10, 2025,pollismolen Opitteren

A pleasant walk, mainly on unpaved paths.
The boardwalk at the Polismolen is unfortunately closed because it is in very poor condition.

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Itterbeek Valley Wetlands – The Green Marsh loop from Opitter

Brouwerij Cornelissen

Sint-Trudo Church Opitter

Opitter Castle Park

Boardwalk Through the Wetlands