France - Monaco
Italy - Vatican City
Scotland - England, if that counts
US-Mexico
Belize-Guatemala
Honduras-Nicaragua
Costa Rica-Panama
Italy-Vatican City
Brooklyn-Queens?
Nicaragua-Costa Rica was a river ferry since there was no way to cross by land in the area. Does that count?
US - Mexico
Mexico - Guatemala
Germany - Poland
Poland - Slovakia
Hungary - Slovakia
Italy - Vatican City
Zero.
Just to add to the above, by watercraft crossing into Canada, remembering I also walked across the bridge at Niagara Falls.
If we are also including state boarders, I thru hiked the AT, so that’s 14 states, however many back and forth crossings between adjoining states as the trail crosses some boarders so many times that the ATC just splits the mileage between the states to make it easy to calculate. Sometimes the trail is on the boarder with one foot in one state and one in the other.
Italy-Vatican
US - Mexico
Italy - Vatican City
US - Canada
Belgium - Netherlands (multiple times just walking down a street!)
Rainbow Bridge to Canada; Via Della Conciliazione to the Vatican City.
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US-Mexico (at TJ)
Thailand-Laos
China-Hong Kong
China-Myanmar
Zambia-Zimbabwe
Maybe Belgium-Luxembourg, it was kind of hard to tell, because I definitely started and ended up in Belgium.
South Korea-North Korea, in one of those blue UN huts on the military demarcation line. And yes, I definitely returned to South Korea.
US-Mexico in El Paso, both directions.
Spain-France, both directions, multiple locations.
Spain-Andorra, both directions. It’s real close to Seo d’Urgel, we hadn’t even intended to go “up to the border”.
Switzerland-France, Basel-St. Louis, multiple times and several actual points. I used to live and have my office in Basel but do most of my shopping in St. Louis; then I moved to St. Louis. All of this while actually working 4 days/week in Germany, but I didn’t walk there.
US - Mexico (shopping trip into Nogales)
Belize - Guatemala (walked across bridge while our guide got our passports stamped)
Italy - Vatican City (this seems like cheating)
US-Canada in 2 locations.
US-Mexico in TJ.
This.
Maybe once between Haiti and DR while hiking through the mountains along/near the border, but I can’t be sure.
As far as I recall, it’s zero.
The only border I’ve ever crossed is the American-Canadian one. I’ve crossed it numerous times but I think it was always by car.
On foot? Only one: Mexico-Guatemala (and back), when visiting the Lagunas de Montebello.
Are we going to county embassy land, too? I could add a few more…
I’ll join in with Italy-Vatican City
I’m pretty sure we got off the bus and walked across the border from Chile to Argentina. Pretty sure we stayed on the bus for Argentina to Brazil.
How do we count river journeys? I got on a boat in Austria and got off it in Hungary.
Or ferries? Got the ferry from Marmaris in Turkey to Rhodes.
Definitely walked:
Malawi to Zambia (and back again)
Peru to Bolivia (and back again)
All in all, considering I’ve visited fifty countries, very few walking across borders has happened.
Traveling by bus in Africa, you often have to disembark at a border crossing, walk across the line, and then get back on the bus. No idea why.
So I have walked:
Ghana - Togo
Ghana - Burkina
Ghana - Cote d’Ivoire
Zambia-Zimbabwe like Ravenman, and probably at the same place; the Victoria Falls Bridge, over the gorge near the Falls. Went there to eat lunch (after dodging a grouchy elephant) and then back to Zambia.
Germany-Austria (Zugspitze)
Germanyy-DDR (Berlin)
Netherlands-France (Sint Maarten)
Netherlannds-Belgium (Baarle-Nassau/Hertog)
Netherlands-Germany (Pre-Schengen, had to get off your bike)
Czechoslovakia-Germany (got to the border in a truck, away from the border in a different truck, many questions and short walk in between)
US-Canada (Niagara)
Chile-Argentina (navigation error during hike)
France-Monaco