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%
12%
5%
1%
116
flagCanada
76%
11%
4%
6%
63
flagthe Netherlands
76%
7%
7%
7%
13
flagGermany
66%
14%
5%
12%
141
flagPoland
64%
15%
9%
10%
3184
flagGreece
63%
27%
9%
0%
11
flagthe United Kingdom
58%
25%
6%
10%
48
flagSwitzerland
57%
14%
0%
21%
14
flagAustralia
56%
37%
6%
0%
16
flagIndia
46%
33%
13%
6%
15
flagAustria
30%
38%
0%
30%
13