A circle is drawn from the center of Croatia (Novi Grad, Bosnia and Herzegovina). Yes, the center of Croatia is not in Croatia.
It is 1900 km in radius (1181 miles).
What countries does it go through?
Only the countries that the 1900 km line goes through count.
For example: Slovakia does not count as it ranges from 317-647 km.
For example: Sierra Leone does not count as it is more than 1900 km away.