In 2014, we traveled into the very center of southern Norway via the stunningly beautiful Telemark canal.
The canal was built 1861-1892 for the purpose of transporting timber, stone and iron products. Eighteen manually-operated locks 98 long x 21 wide. All with lift/drop of less than 15 feet. Navigable depth is 5-6. Overhead clearance is an amazing 42 or more.
You can read more about the Telemark canal here:
https://www.telemarkcanal.com/
(Note if some data/tables appear to be missing, switch the page language from English to Norwegian)