Like all the GR routes in Europe, this route is a well established long distance walking path.  GR meaning grande randonnée which literally translates to 'grand route'. They are well known for their typical white/red route markers. Most GR-routes run over very long distances, often passing through entire countries. 

This one however is a local GR-route, making (kind of) a loop through one region, namely the eastern part of Belgium. While doing so it crosses through different geografical zones. 

https://svansoerund.wordpress.com

New route for ultrarunning around the peninsula of Schwansen in northern Germany.  See website for details. 

There are two variations to this route, a 100KM and a 100Mile. Both GPX files are below, read the descriptions for each, download and plot the GPX files to view each route.

Distance: 100km / 100mi

Vertical Gain : 2564m / 4416m

100KM (Route created by Geoff Arnold)