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

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Rank	Country or territory	Total length of land borders (km)	Total surface area (km²)	Border/area ratio (km/km²)	% Correct
2	Canada	8,893	9,984,670	0.0008907	95%
3	Russia	20,017	17,098,242	0.001	94%
4	United States	12,034	9,526,468	0.001	94%
1	Vatican City	3.2	0.44	7.272	94%
12	China	22,147	9,596,961	0.002	93%
2	Monaco	4.4	2	2.2	93%
8	Brazil	14,691	8,514,877	0.001	91%
3	San Marino	39	61	0.639	87%
5	Andorra	120	468	0.257	86%
11	Mexico	4,353	1,964,375	0.002	85%
6	Luxembourg	359	2,586	0.138	82%
4	Liechtenstein	76	160	0.475	80%
6	United Kingdom	360	242,900	0.001	80%
20	Argentina	9,665	2,780,400	0.003	79%
5	Indonesia	2,830	1,910,931	0.001	79%
10	Saudi Arabia	4,431	2,149,690	0.002	72%
7	Denmark	68	43,094	0.001	69%
13	South Korea	238	99,828	0.002	69%
16	Algeria	6,343	2,381,741	0.002	64%
19	Turkey	2,648	783,562	0.003	64%
7	Brunei	381	5,765	0.066	60%
17	Iran	5,440	1,648,195	0.003	60%
9	Gambia	740	11,295	0.065	59%
15	Egypt	2,665	1,002,000	0.002	57%
8	Slovenia	1,334	20,273	0.065	57%
11	Israel	1,017	20,770	0.048	54%
10	Kosovo	701	10,887	0.064	54%
12	Belgium	1,385	30,528	0.045	53%
20	Rwanda	893	26,338	0.033	53%
14	Libya	4,348	1,759,540	0.002	52%
19	Burundi	974	27,834	0.034	51%
14	Switzerland	1,852	41,284	0.044	51%
18	Croatia	2,197	56,594	0.038	50%
13	Montenegro	625	13,812	0.045	49%
15	Lebanon	454	10,452	0.043	46%
17	Moldova	1,389	33,846	0.041	46%
16	Armenia	1,254	29,743	0.042	42%
18	Yemen	1,746	527,968	0.003	42%
1	Sri Lanka	0.1	65,610	0.0000015	41%
9	Papua New Guinea	820	462,840	0.001	36%