The Agde Round Lock is a canal lock on the Canal du Midi that connects to the Hérault River in Agde France. It is almost unique because it is round, which allows a boat to turn around, and the fact that it has three sets of lock gates, each with a different water level. It was built in 1676 of volcanic stone and was originally 29.20 m in diameter, 5.20 m deep.
The lock is no longer round. It was expanded during a program begun in 1978 to expand locks to the Freycinet gauge to allow for barges up to 38.50 metres long.
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