List of countries (+ their clearly distinct areas or islands separated by sea) that I've travelled so far (2022):
1. Austria
2. Belgium
3. Croatia
4. Czech Republic
5. Denmark
6. Estonia (+ Saaremaa)
7. Ethiopia
8. Finland (+ Åland, Korppoo, Hailuoto)
9. France (+ Corsica)
1/3
10. Germany
11. Greece (+ Crete, Santorini, Ios, Naxos, Paros, Antiparos, Paxos)
12. Hungary
13. Ireland (+ Skellig Michael)
14. Italy (+ Sardinia, Sicily, Capri, Venice)
15. Latvia
16. Malta
17. Monaco
18. The Netherlands
19. Norway
20. Portugal (+ Madeira, Azores)
2/3
21. Romania
22. Russia
23. Serbia
24. Spain (+ Catalonia, Gran Canaria, Lanzarote, Mallorca)
25. Sweden (+ Gotland)
26. Thailand (+ Phuket, Phi Phi, Ko Racha)
27. Tunisia
28. United Kingdom (+ Gibraltar)
29. United States (New York, Cleveland, Colorado)
30. Vatican City
3/3