Canal du Midi in Agde
UNESCO World Heritage 1996 · Round Lock, unique in France
The Canal du Midi, UNESCO World Heritage since 1996, passes through Agde and leaves behind a hydraulic treasure: the Round Lock. This circular structure with three gates — unique in France — allows boats to head towards the sea via the River Hérault or continue towards Béziers or the Étang de Thau. The century-old plane trees along the banks make a must-walk promenade.
The Round Lock — a unique structure
Of the 328 locks on the Canal du Midi, only one is round: the one in Agde. Built in 1676 by Pierre-Paul Riquet, the canal's engineer, it solves a particular topographical challenge: at Agde, the canal needs to let boats reach the Mediterranean via the River Hérault, or continue towards the Étang de Thau.
Its circular shape and three gates (towards Béziers, towards the sea, towards the Étang de Thau) are a 17th-century engineering achievement that hydraulic engineers still study today.
Boating and walks
Walking
Canal banks accessible from Agde town centre. Plane trees, views of the lock.
Cycling
Cycle path along the canal to Béziers and Sète. Flat terrain, ideal for families.
Boating
Boat hire (with or without licence) and cruises from Agde.
Frequently asked questions
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