The "Diamond Double" or "Diamond Lake Double" is a classic peak linkup of Southern Oregon, tying Mt. Bailey (8,376') with Mt. Thielsen (9,183') running past Diamond Lake (5,183') in between. At a marathon in distance, and over 7k' in gain with high-4th/low-5th scrambling, this route delivers.

Hangers Way is a 21 mile long footpath through Hampshire, England. It starts at Alton railway station and finishes at Queen Elizabeth country park where it meets the South Downs Way National trail 

Sentinel Pass via Larch Valley Trail is a 6.8 mile heavily trafficked out and back trail located near Lake Louise, Alberta, Canada that features a lake and is rated as difficult. The trail is primarily used for hiking, camping, nature trips, and bird watching and is best used from June until August.

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.