The rivers la Brune and la Serre meet in Marle after irrigating lush villages. Throughout the circuit, it is a festival of the most beautiful fortified churches of Thiérache, between hedgerows and lush meadows.
Source: Agence Aisne Tourisme
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<p><a class="routeYou_embed" href="https://app.routeyou.com/en-fr/route/view/19051097?utm_source=embed&utm_medium=article&utm_campaign=routeshare&navigation=external" title="The Aisne by bike: the Brune and the Serre - RouteYou" target="_blank"><img src="https://image.routeyou.com/embed/route/960x670/19051097-en@2x.png" style="width: 100%; height: auto;" alt="The Aisne by bike: the Brune and the Serre"></a></p>
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