Cyprus/Turkish Republic of Northern Cyprus, several times (the in-laws lived in the south until recently, but the cheapest and fastest air itinerary by far for us was usually Turkish Airlines to Ercan in Northern Cyprus).
So I asked my mom the world traveler about this. She’s been to dozens of countries*, on all seven continents, and she says that she doesn’t think she’s ever once walked across a national border. Which means that I can scratch Canada off of my list, too: All of my trips to Niagara Falls were with her (when I was too young to be left unattended), so if she hasn’t, I haven’t, either.
*Off the top of my head, she’s been to Canada, the US (of course), Mexico, El Salvador, Peru, Chile, Argentina, Iceland, Ireland, England/Scotland, Denmark, Egypt, Uganda, Tanzania, Uzbekistan, Turkmenistan, Kazakstan, India, Nepal, China, Mongolia, Laos, Thailand, Cambodia, Vietnam, Australia, New Zealand, and Antarctica.
I keep seeing doubts that The Vatican City counts. I would tend to count it since it is at least technically a sovereign nation. The US sends an ambassador there.
Zero here - hell, I think I’ve only ever once walked across a state border (Carowinds theme park; the NC/SC border runs right through it).
Someone we know who grew up in very rural Quebec told us she was pretty sure she crossed over once or twice by accident. A friend who worked in Buffalo (I think; somewhere nearish Niagara) said she would periodically walk over to the Canadian border for lunch.
Only one, I think: Mexico-Guatemala, in 1997. I was part of a three-day walking/camping excursion with the director of the Calakmul Biosphere Reserve and several Maya men from villages over 100 km away, whose villages were titular owners of large parts of this vast tropical forest.
The forest path led to a narrow clearing along the border, and a crude stone marker. (The Guatemala portion of this forest is called the Petén). We walked across, took a picture (someone suggested we hold hands), then started our trek back north toward civilization.
During the last couple of years the great majority of Central Americans have crossed near the highway near the Pacific, very far from my forest path.
I forgot about two more: Israel-Egypt (at Elat, since the best way to get from Turkey to the scuba diving at Sharm-el-Shek is to fly to Tel Aviv, take bus to Elat, walk across to Egypt, take taxi to Sharm)…
…and Argentina-Brazil (just to get a better view of Iguazú Falls)
I have lived in New Zealand, entirely surrounded by ocean. I have lived in Australia, entirely surrounded by ocean. And once I went on a holiday to Fiji, also entirely surrounded by ocean. I have never been anywhere else. So, the answer for me is none.
Only the :dubious: ones: Italy/Vatican, England/Scotland and England/Wales.
We used to walk the dog over the England/Wales border all the time, it being less than a mile from the house, so what that one loses in internationalness it makes up in volume.
Yeah, I don’t remember border control coming onto my safari truck, so I can probably add a bunch more.
South Africa Namibia
Namibia Botswana
Botswana Zimbabwe
Zimbabwe Zambia
Zambia Malawi
Malawi Tanzania
Tanzania Kenya
Kenya Uganda
Uganda Rwanda
South Africa Lesotho
South Africa Swaziland
Swaziland Mozambique
Bumping this to add to my meagre total. Today I walked from France to Germany and back. The (slightly) interesting thing is that the means to do so are actually designed for you to make the border crossing on foot (well, you can do it on a bike as well).
Strasbourg has a footbridge across the Rhine - the border with Germany. Come on, you’d take a tram ride out there just to walk the bridge - wouldn’t you?
I believe only France → Italy, Italy → Switzerland, and Switzerland → France. The other possibility would be USA ↔ Canada at Niagara, but don’t recall as I was a kid.
Walked? none.
But I have crossed the US/Canada border by:
Bicycle (Sault St Marie)
Car (Pigeon River)
Train (White Pass RR)
Ship (Seattle-Alaska Cruise that stopped in Victoria)