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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Elevation 160 m

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Saturday 15 November

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100 %

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Max wind speed: 5.0 km/h

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See hikes here

Take Me There

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 of De Coolen loop from Millen

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

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