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May is still borderline if you plan on going into high mountains (Alps, Dolomites or Pyrenees), depending on how the season goes there might still be snow (like this year).
Spain is a good shout, one idea could be to ride the Pyrenees from Girona to San Sebastian, then continue along the north coast and make it all the way to Porto and Lisbon.
Balkans is also a great option in my opinion.
Or just spend the whole time traversing dolomites and alps..
Depends what you are looking for in your trip in terms of route and culture
I have 4-5 weeks of holiday to use, so am looking at taking May off for a tour, anyone got any recommendations of road only (sadly no gravel bike) routes in the 3k km for Europe? Did Istanbul to london last year so was thinking maybe around Spain or Italy but early days still and nothing is calling out yet.