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
flagRepublic of Ireland
85%
14%
0%
0%
14
flagthe United States
77%
13%
5%
1%
118
flagthe Netherlands
76%
7%
7%
7%
13
flagCanada
75%
11%
5%
5%
68
flagGermany
67%
15%
5%
11%
146
flagPoland
64%
15%
9%
10%
3237
flagGreece
63%
27%
9%
0%
11
flagthe United Kingdom
57%
24%
6%
12%
49
flagSwitzerland
57%
14%
0%
21%
14
flagAustralia
56%
37%
6%
0%
16
flagIndia
50%
33%
11%
5%
18
flagAustria
35%
35%
0%
28%
14