A circumnavigation of Block Island, 13 miles off of Rhode Island. All on the beach with rocky terrain, and a swim across a channel 9.5 miles in. Pretty flat, but difficult terrain. 

Officially opened 2020, the "Welser Höhenweg" is the East to West crossing of the "Tote Gebirge" mountain ridge from Hinterstoder to Bad Ischl.

https://www.alpenvereinaktiv.com/de/tour/welser-hoehenweg-totes-gebirge…

The "Baiersbronner Seensteig" is a premium long distance hiking trail within the "Black Forest National Park" in the south west of Germany. It was voted as one of the most beautiful hiking trails by the German Hiking Association. Officially the route consists of five stages, some with extra lead ins from the public transport stations to reach the actual course.

The Beacons Way is a long distance route that traverses the entire width of the Brecon Beacons National Park in Wales, United Kingdom. Typically done from East to West it starts in the town of Abergavenny and finishes in Llangadog village. The route takes in some of the most notable peaks in the national park including the highest mountain in southern Britain - Pen-y-Fan.