Łukasz Supergan posted a terrific summary of options for hiking across Iceland.
I’m looking to do some bike touring and hiking summer 2022. #research
Łukasz did the #4 route (green) in winter, for example.
He recommends we do it in summer.
Variant no. 2 may be the easiest, but it leads through the roads used by cars, which may be tiresome.
Variant no. 1 is more demanding.
Variant no. 3 is the fastest traverse from all of the options. Going east-west requires more time and planning, and it is combined with bigger difficulties (less roads, more paths and sometimes the wilderness, crossing the rivers, long distances with no water). Choose it, if you are sure of your skills and you can survive far away from people. …Crossing Iceland. Part 1: the route and preparations
I’m also researching options for bikepacking Iceland.