16 countries - 16 summits

June 2023 - 16 countries and their highest summits - by fair means, cycling between the 16 ascents and no artificial oxygen... one might notice that I took care to color the 16 countries along the four color theorem, a bit of a nerd maybe...
There are the Seven Summits (or my own interpretation of them) and of course 14 Eight-thousander, but 16 is bigger than 14 and 7, so I call this the ultimate challenge, the last adventure...