This route connects Skogar to Landmannalaugar. It is 50 miles and 10,000 feet of vert. This is the most popular backpacking route in Iceland because it is some of the most interesting 50 miles on the planet, including: waterfalls, glaciers, rivers, ocean views, geothermal activity and much, much more.

https://www.summitpost.org/hiking-the-laugavegur-and-fimmv-r-uh-ls-trail/1007421

The Royal Canal is a way marked route follows the along the banks of Irelands Royal Canal for 145.6km (90miles) from the River Liffey in Dublin City Centre to the Camlin River which connects to the River Shannon in Cloondara, County Longford, passing through counties Kildare, Meath and Westmeath enroute. The Royal Canal was built between 1790 and 1817 to link the capital of Ireland to its largest river and allow trade and produce move more easily through the country.