Flags
Madrid
Spain
Only bordered by spain
Portugal
United Kingdom to the nearest 10 million (As of 2019)
66.65 million (70m is accepted answer)
Seoul
South Korea
Canada and Mexico
USA
China Population to the nearest 100 million (as of 2018)
1.39 billion, accepted answer is 1.4 billion
Canberra
Australia
North Korea
South Korea
Japan population to the nearest 10 million
126.5 million (130m is accepted answer)
Stockholm
Sweden
Denmark, Austria, France, Czech Republic, Poland, Switzerland, Belgium, Luxembourg and Netherlands
Germany
Nigeria Population to the nearest 10 million, as of 2018
195.9 million, 200 million is accepted answer
Ankara
Poland, Slovakia, Hungary, Russia, Romania, Moldova, Belarus
Ukraine
38,749 (39k is accepted answer)