The Souterrain de Mont de Billy

Rather that go up and over the top of the hill, the tunnel of Mont de Billy goes about 2.3 km through the hill.


We have the green light so in we go!


The tunnel is lighted so it's not completely claustrophobic in there. A half hour later we were out and this hotel barge shoehorned it's way in.

After the tunnel there was a chain of eight locks down and we entered the canal alongside the Marne River. In about 15 k we'll enter the Marne itself.