Which country has the longest combined land border?

Russia
United States
Brazil
China
China's combined land border measures 22,117 km (13,743 mi) from the mouth of the Yalu River to the Gulf of Tonkin. China borders 14 nations, more than any other country except Russia, which also borders 14.
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Answers by country

Russia
United States
Brazil
China
answers
flagAustria
50%
0%
6%
43%
16
flagIndia
35%
21%
0%
42%
42
flagRepublic of Ireland
52%
4%
0%
42%
21
flagthe United Kingdom
47%
21%
3%
27%
118
flagPoland
54%
11%
6%
26%
13710
flagUnknown
50%
15%
7%
26%
26
flagGreece
46%
28%
0%
25%
28
flagthe Netherlands
42%
26%
10%
21%
19
flagGermany
57%
17%
4%
20%
94
flagAustralia
61%
15%
0%
19%
26
flagthe United States
49%
25%
5%
18%
236
flagFrance
78%
0%
7%
14%
14
flagItaly
60%
30%
0%
10%
20
flagIsrael
50%
30%
10%
10%
10