South China Morning Post
https://www.scmp.com/lifestyle/travel-leisure/article/3272420/19-long-distance-routes-european-cycling-holiday-plus-how-plan-your-own
19 long-distance cycling routes make exploring Europe by bike a snap
Exploring Europe by bicycle has never been easier. Cycle route network EuroVelo lists routes that criss-cross the continent, and offers a custom route planner to help cyclists create their own itineraries.