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
86%
4%
2%
4%
46
flagRepublic of Ireland
83%
16%
0%
0%
12
flagthe United States
76%
14%
4%
2%
99
flagGermany
67%
13%
5%
11%
102
flagPoland
63%
15%
8%
10%
2851
flagGreece
63%
27%
9%
0%
11
flagAustralia
60%
33%
6%
0%
15
flagSwitzerland
60%
10%
0%
20%
10
flagthe United Kingdom
54%
24%
8%
13%
37
flagIndia
33%
41%
16%
8%
12