The GR 1A runs from Blaincourt-les-Précy to Noisy-sur-Oise to join the GR 1.
The GR 1® covers more than 550 km of the Ile-de-France region, with around 15 km in the Oise between Orry-la-Ville and Ermenonville in the Chantilly and Ermenonville forests, passing through the Comelle ponds and the Butte aux Gens d?Armes, and near the villages of Montgrésin, Potarmé and Thiers-sur-Thève.
Source: SIM Hauts-de-France - Oise Tourisme
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<p><a class="routeYou_embed" href="https://app.routeyou.com/en-fr/route/view/19050898?utm_source=embed&utm_medium=article&utm_campaign=routeshare&navigation=external" title="GR® 1 A - Rejoindre le Tour d'Ile de France - RouteYou" target="_blank"><img src="https://image.routeyou.com/embed/route/960x670/19050898-en@2x.png" style="width: 100%; height: auto;" alt="GR® 1 A - Rejoindre le Tour d'Ile de France"></a></p>
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SIM Hauts-de-France - Oise Tourisme
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