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France
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Boulogne-Sur-Mer
Ambleteuse

La Slack Lock

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La Slack Lock

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Cycling

Gravel riding

by 183 explorers out of 191

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    Location: Ambleteuse, Boulogne-Sur-Mer, Hauts-De-France, France

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    Tips

    April 28, 2023

    Cycling

    The Slack is a small coastal river, which flows into the sea, near Fort Ambleteuse.
    Although modest today, the Slack was much more imposing in the past, when the gravel was mined near the fort. At the time of the Camp de Boulogne, between 1803 and 1805, Napoleon had even thought of bringing his fleet here. Suffice to say that the Slack was something else!
    Translated by
    Historic locks of the narrow old canal, almost overgrown. Great view from the bridge along the length of the canal toward the coast, and from Le Touquet to Sainte-Cecile. Stairs lead down to explore the ancient locks and pass under the bridge.

    July 6, 2025

    Cycling

    beautiful walk with departure and arrival at the fort of Ambleteuse. At low tide you can wade through the river at the height of the fort.
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    Routes here

    Best routes to La Slack Lock

    4.5

    (90)

    597

    riders

    1. Fort d'Ambleteuse – View over Wimereux loop from Pihen

    64.2km

    04:02

    660m

    660m

    Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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    Hard

    Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

    Moderate

    4.6

    (29)

    95

    riders

    Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

    Moderate

    Details

    Informations

    Elevation 60 m

    Weather

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    Tuesday 10 February

    11°C

    8°C

    57 %

    Additional weather tips

    Max wind speed: 32.0 km/h

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    Location: Ambleteuse, Boulogne-Sur-Mer, Hauts-De-France, France

    Other Popular Places to Check Out

    Fort d'Ambleteuse

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