I see your Panama Canal cruise and raise you the Corinth Canal

[smokeybandit]

 

" with its travelers almost able to reach and touch the sides of the canal, 24 meters wide at its narrowest point."

[Neaxan]

My parents cruised through the Canal of Corinth about 20 years ago and say it's the most amazing cruise they ever had. It feels as if you could touch the walls (of course you can't). Their ship even had to drain all the pools to be able to pass through the canal because they'd have had too much draft.