France's longest border is with Brazil

Honestly I'm more surprised that the border with Belgium is longer than the border with Spain

I think it's just measuring the longest contiguous border.

The border with Spain has Andorra in the middle
- There isn't a 2nd number on the east side of Andorra so I think the 623 is the total with Spain.
During the times of Caesar, Belgica started just north of Paris.

Arnt most borders fractals so can any border be the largest?

No, because borders are made up by humans and humans can't write down or even measure infinitely small
- Some borders drawn as straight lines on maps sure. But we also define borders by rivers and all sorts of other fractal things.
- Borders are just social construct
- We can if we make tools to do it for us.
- No, I can write limits.
You'll have to represent each border on the same scale, so no. Also, why are you being flagged as a bot?
- I was writing a bot and must have accidentally enabled it for my main account. Fuck im retarted.
  
  Even Firefox's coloured containerisation can't fix stupid
- Anyone can just go into their account settings and mark their accout as a bot. Idk why you would though
Yes, but non-coastal borders become nice curves at a certain resolution just because they're legally defined by points.

Coastal borders are legally vague AFAIK, since they're defined as a nautical mile from "the shore" or something like that, but when you're already on the ocean a matter of a few meters tends not to matter.
considers

Well, they aren't fractal, that's for sure.

It is true that we could make borders more-closely-map to physical features, and that would increase the length somewhat.

And we can define borders however we want, so that's up to us.

But ultimately, matter is quantum, not continuous, so if we're going to link the definition of a border to some function of physical reality, I don't think that we can make a border arbitrarily long.
- Coastlines are indeed fractals, and a similar argument could be made for any border defined by natural phenomena (so like, not the long straight US/Canada border).
- Well, quantum mechanics is continuous, just in a way that often maps to discrete things when measured. I'm sure someone has written a research paper on quantum law, but I wonder if anyone who actually knows quantum mechanics has.
Longest*

How did you get that wrong when it's correct in the title...?

And what you're talking about is not borders, it's coasts. Borders are much more specific since they're completely made up by us. They have very specific lengths.

It's actually impressive how much you got wrong in your comment. If I was in the same class as you, I would have worked hard to never be in the same group as you because it's pretty certain you've failed to understand many other simple and obvious things. I'm almost curious about what other things you've misunderstood.
- Yeah, you're honestly way out of line here.
  
  Being correct is not a virtue. Other people are not impressed by how correct you are, or by how great a job you've done in correcting others.
  
  Knowing more than others is not a virtue. Literally everyone knows less about some things than others; there is no super genius that is right or most knowledgeable about everything. For that reason (and many others), lack of knowledge is not a good reason to treat someone poorly.
  
  You obviously care about the mechanics of clear communication. I believe that you can be better than this, that you can keep in mind why we communicate, not just how. You obviously know a lot about certain topics as well. I believe you can be better at how you demonstrate your knowledge. This time you showed off your knowledge to shame someone else. Maybe next time you could show off what you know by sharing it with someone in a helpful way.
  
  Then people really would be impressed.
- Wow, what the fuck happened to you to make you like this? It's a post about a map.
- Wow, you're an asshole. Many borders are (or were) defined by positions of natural features though, so no you're wrong. They aren't completely made up by us. They are made up, but based on nature.
- It's called a synonym. Get yourself a Thesaurus and read it.
  
  I too would avoid being the team with you, considering your commitment to being an asshole.

this would be a great trivia question

"EU's largest national park is in South America" is a fun fact.
- Canada is closer to the EU than the island of Great Britain is

They also have a border with Canada at St Pierre & Miquelon.

The map only includes land borders. St Pierre and Miquelon are islands, so they have none. France has several small islands scattered around the world as legacy of the French Empire which are also absent from OP's map for the same reason. Saint Martin on the center left is a notable exception, since it's divided in two between France and the Netherlands.

And France is the only one country that spans across all time zone on the globe.

I'm pretty sure that French territory doesn't span all time zones on the globe.

hits Wikipedia

Yeah. They're in a lot, but certainly not all.

French territory:

https://commons.wikimedia.org/wiki/File:France_in_the_World_(%2BAntarctica_claims).svg

Time zones:

https://upload.wikimedia.org/wikipedia/commons/e/ec/World_Time_Zones_Map.svg

Take, say, UTC+8, to pick one arbitrary zone.
- They misspoke and bizarrely doubled down when corrected, but they are touching upon an interesting fun fact. That it's always daytime somewhere in France.
- I didn't realize French territory is so widespread.
  
  So if the U.K. ever complies with the UN and the ICJ and relinquishes control of the Chagos Islands to Mauritius, the sun will set on the British empire, but not on France.
  
  That'll be funny as fuck and I hope France never misses an opportunity to point it out.
- It is in the most timezones of any country, so I expect that that's the idea they were half-remembering
- that's some dedication here
- There's pretty much nothing right along the international date line, regardless of country. If you're trying to collect them all you better not care about +12 vs -12. As you can see your options are also limited for -1 and -2.
  
  Unrelatedly, I'm curious what the story is with Central vs. Mountain time in Nunavut. That's quite the wasp-waist for such a vast, mostly empty area.
- If you‘re so picky, I‘ll as well. I wrote it spans across, not includes all.