Locks and flood gates aren’t the only challenge.
We, successfully, made it through our first tunnel as we cruised up the Saône from Auxonne. I was a bit nervous. It was long, narrow, and with little headroom. There are other tunnels that are even more restrictive – I’m not sure Aleau would fit through them. I’m not sure I’d want to try. This was challenging enough. At least it had lights. Many others don’t.
