A trail of 112 km around the village Horst a/d Maas, the Netherlands.
https://wandelpin.nl/blog/wandelen/petranpad/
There is a race on this route, and supported FKTs are likely to be set in the race: https://www.petranpad.nl
A North to South road run from Hermaness NNR car park to the life size Orca sculpture at Sumburgh Head Light House, traversing the islands of Unst, Yell and Mainland Shetland. The aim is to run it on the summer solstice, starting at sun rise and finishing before sun set (c18.5 hours). Involves 2 ferries which really dictate your pacing.