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
87%
4%
0%
4%
24
flagGermany
81%
10%
0%
8%
37
flagthe United States
75%
15%
4%
2%
72
flagPoland
62%
17%
8%
10%
2152
flagthe United Kingdom
45%
35%
5%
15%
20