One
190 miles
British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, and Quebec are the Canadian Provinces that shares their southern border with USA.
Mexico is the only one.
Russia is a very large country and has many countries that border it. Russia borders the Pacific Ocean to the East and Kazakhstan, Mongolia, China, and even North Korea on its southern border. Southeast of Russia would be water near Japan.
5
Vermont is 37 miles wide at the southern border with Massachusetts
about 60 miles
298 miles
Only one nation shares a common border with the USA's southern border: Mexico.
Greece is a country in Southern Europe with many islands. such as crete, & ETC.
It is 298 miles grime each other
Many nations have had a "foreign legion", but the French Foreign Legion is the most popular.