Interesting topic!
I've lived in Ireland, England, Scotland, Greece, Qatar, Bahrain, USA and UAE.
Then I've visited Northern Ireland, Wales, France, Germany, Spain, Belgium, Norwary, Denmark, Sweden, Portugal, Poland, Monaco, Italy, Vatican, Czechia, Hungary, Croatia, Netherlands, Turkey, Jordan, Saudi Arabia, Oman, Maldives, Sri Lanka, Singapore, Thailand, Indonesia, China, Japan, Canada, Panama and Costa Rica.
I think that's 40! I've yet to get to Africa or South America so plenty of travelling left to do.