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Tour of Laon: ‘The Butte de Laon: water from the bottom to the top’

Etang des moines de l'abbaye Saint-Vincent
Credit : OT Pays de Laon

Description

Because of its geological structure, the hillock is full of springs, both in the medieval belt and on the plain. 
A particular feature of Laon is that the emergence of these springs from different water tables (limestone and sand) encouraged the development of water-supplied districts such as Semilly and Ardon in the lower town and Saint-Vincent Abbey in the upper town.

Forgotten today, these structures deserve to be better known. On this tour, you'll discover the geological nature of the hillock, its associated flora and its heritage created around water!

Technical Information

Walking
Difficulty
Medium
Duration
1h15mn (1d)
Dist.
4.7 km
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Altimetric profile

Starting point

1 Bis Rue Jacques François Glatigny , 02000   Laon
Lat : 49.5607Lng : 3.61008

Points of interest

Additional information

Vegetation on the mound

The flora on the entire hillock is predominantly calcicolous and does not reflect the nature of the predominantly sandy terrain, with the exception of the limestone strata at the top. These have been covered by ‘colluvium’ enriched with calcium carbonates, caused by run-off and erosion of the limestone.
All of these environments have been extensively modified by man over the centuries.

In dry areas (such as the sloping area around the rue de la Vieille Montagne), you may come across :

  • trees : common ash, black locust (false acacia), small-leaved lime, sycamore maple, pedunculate oak, etc.
  • Shrubs: hawthorn, country elm, black elder, common privet, blood dogwood, wild rose, European fusain, blackthorn, hazelnut, bramble, lilac, etc.
  • Climbing plants: clematis, ivy, etc.
    On the other hand, when these sands outcrop, a dry heath with callunes settles on this acid soil.

As for wetlands (such as the area around the Bousson cemetery) where there is a water table and which have been much disturbed by man, you will see :

  • Shrubs, such as willow;
  • and herbaceous plants: horsetail, round-leaved mint, common reed, comfrey, etc.

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Caution!
We have no information on the difficulty of this circuit. You may encounter some surprises along the way. Before you go, please feel free to inquire more and take all necessary precautions. Have a good trip! 🌳🥾