Canal de Marseille au Rhône

The Canal de Marseille au Rhône connects the Mediterranean Sea at Marseille to the Rhône at Arles.  It is  81 kilometres (50 miles) long.   The section between Marignane and Marseille has been closed since the collapse of the Rove Tunnel in 1963.  

It was built between 1906 and 1927. The Rove tunnel is  the longest canal tunnel in the world -  7,120 metres (23,360 ft). 

References

Category:Canals in France