Patrick Martin submitted this 320-mile Route which circumnavigates the San Francisco Bay mostly via the Bay Area Ridge Trail.

This is a complete loop of the São Miguel island with a total of about 230km.  Mostly trails, passing through small towns on the way.
 

A 130km coast-to-coast route following mainly path, gravel roads and some bike path - traversing mainland Denmark.

https://www.kyst-kyststien.dk/ 

The objective is to cross Texas on foot, on roads, at its widest point by the shortest means / time possible in the safest practical way. Any route across the widest part of the state that does not make substantial use of illegal, dangerous, or private roads should be considered equivalent. Runner may select route -- does not have to be the exact GPX uploaded here.  Approx. 850 miles.