The Coolen or the Kuilen is a medium-sized marl cave with a network of tunnels of about one kilometre. In contrast to the larger quarries of Zichen and Zussen, the Coolen was a 'farmer's quarry' from which the owners or families extracted marl when the need arose. Since 1988, the quarry has served as a bat reserve.

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Best routes to De Coolen Nature Reserve

4.0

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1. De Coolen Nature Reserve – Marl Caves at De Coolen loop from Val

7.91km

02:04

50m

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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Moderate

5.0

(1)

hikers

2. De Coolen Nature Reserve – Marl Caves at De Coolen loop from Millen

5.77km

01:30

30m

Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

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Easy

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3. St. Stephen's Church Millen – Millen Moated Castle loop from Wonck

9.63km

02:30

60m

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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Moderate

Details

Informations

Elevation 160 m

Weather

Tuesday 10 February

11°C

8°C

84 %

Additional weather tips

Max wind speed: 23.0 km/h

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Location: Riemst, Tongeren, South Limburg, Flanders, Belgium

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De Coolen Nature Reserve

1. De Coolen Nature Reserve – Marl Caves at De Coolen loop from Val

2. De Coolen Nature Reserve – Marl Caves at De Coolen loop from Millen

3. St. Stephen's Church Millen – Millen Moated Castle loop from Wonck

Other Popular Places to Check Out

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