Riqueval Tunnel

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Riqueval Tunnel

The south tunnel entrance
Overview
Location	Ballicourt
Coordinates	49°58′34″N 3°13′52″E / 49.975998°N 3.2311505°E / 49.975998; 3.2311505
Status	Open
Waterway	Canal de Saint-Quentin
Start	49°57′02″N 3°14′09″E / 49.95061°N 3.235851°E / 49.95061; 3.235851
End	50°00′05″N 3°13′35″E / 50.001386°N 3.22645°E / 50.001386; 3.22645
Operation
Constructed	1801-1810
Opened	1810
Owner	Gabarit Freycinet
Technical
Length	5,670 metres (3.52 mi)
Boat-passable	Yes

The Riqueval Tunnel is a 5,670 metres (3.52 mi)-long tunnel on the St Quentin Canal, close to the commune of Bellicourt, in the department of Aisne, France. It connects Bellicourt with Bony. It was constructed as part of the St Quentin Canal between 1801 and 1810, on the orders of Napoleon.

The tunnel remains in use, and can be traversed using a chain boat. Along with the Mauvages tunnel, on the Marne–Rhine Canal, it is one of the last locations in the world where a system of chain towing is still in operation.

It was the longest tunnel in the world until the construction of Biassa II tunnel, La Spezia, Italy.^{[citation needed]}