Which countries share the longest land border?

USA-Canada
Russia-China
Russia-Kazakhstan
Argentyna-Chile
The border between United States and Canada is the longest one between two states. It measures 8,893 km (5,525 mi).
smyru
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Very interesting!

Answers by country

USA-Canada
Russia-China
Russia-Kazakhstan
Argentyna-Chile
answers
flagCanada
88%
3%
0%
3%
27
flagthe United States
76%
13%
4%
2%
88
flagGermany
72%
10%
4%
10%
47
flagPoland
62%
17%
8%
10%
2294
flagthe United Kingdom
46%
34%
7%
11%
26