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Top 20 countries by border/area ratio: highest and lowest

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Data from http://en.wikipedia.org/wiki/List_of_countries_and_territories_by_border/area_ratio
Countries with no borders not considered!
Quiz by scambigol
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Last updated: June 14, 2014
First submittedJune 13, 2014
Times taken138
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HIGHEST BORDER/AREA RATIO
Rank
Country
Total length of land borders (km)
Total surface area (km²)
Border/area ratio (km/km²)
1
Vatican City
3.2
0.44
7.272
2
Monaco
4.4
2
2.2
3
San Marino
39
61
0.639
4
Liechtenstein
76
160
0.475
5
Andorra
120
468
0.257
6
Luxembourg
359
2,586
0.138
7
Brunei
381
5,765
0.066
8
Slovenia
1,334
20,273
0.065
9
Gambia
740
11,295
0.065
10
Kosovo
701
10,887
0.064
11
Israel
1,017
20,770
0.048
12
Belgium
1,385
30,528
0.045
13
Montenegro
625
13,812
0.045
14
Switzerland
1,852
41,284
0.044
15
Lebanon
454
10,452
0.043
16
Armenia
1,254
29,743
0.042
17
Moldova
1,389
33,846
0.041
18
Croatia
2,197
56,594
0.038
19
Burundi
974
27,834
0.034
20
Rwanda
893
26,338
0.033
LOWEST BORDER/AREA RATIO
Rank
Country
Total length of land borders (km)
Total surface area (km²)
Border/area ratio (km/km²)
1
Sri Lanka
0.1
65,610
0.0000015
2
Canada
8,893
9,984,670
0.0008907
3
Russia
20,017
17,098,242
0.001
4
United States
12,034
9,526,468
0.001
5
Indonesia
2,830
1,910,931
0.001
6
United Kingdom
360
242,900
0.001
7
Denmark
68
43,094
0.001
8
Brazil
14,691
8,514,877
0.001
9
Papua New Guinea
820
462,840
0.001
10
Saudi Arabia
4,431
2,149,690
0.002
11
Mexico
4,353
1,964,375
0.002
12
China
22,147
9,596,961
0.002
13
South Korea
238
99,828
0.002
14
Libya
4,348
1,759,540
0.002
15
Egypt
2,665
1,002,000
0.002
16
Algeria
6,343
2,381,741
0.002
17
Iran
5,440
1,648,195
0.003
18
Yemen
1,746
527,968
0.003
19
Turkey
2,648
783,562
0.003
20
Argentina
9,665
2,780,400
0.003
+1
level 43
Jun 13, 2014
There's plenty more of 0 land border island countries like Sri Lanka, why aren't they included.
+1
level 71
Jun 14, 2014
It's actually 0.1 - I've changed that now, I had rounded lengths to the nearest km so it had turned it into a 0