While we were walking about Paris we watched the action on the St Martins Canal which is just to the northeast of the Marais area and north of the Seine just to the east of the Notre Dame. This was a functional commerce canal in the 1800s, but now hosts mostly tour boats. But the fun part starts here ...

After a couple of locks which drop the boat about 50 feet ... it then drops one more time into the tunnel under the city streets ... cool!

And directly above where the boat is, these guys are playing ping pong in a city park. The park runs for about 2 more miles down toward the Seine River and covers the canal and the ship traffic humming happily below the street level.