Islands Divided by Multiple Countries

Name the countries of the world that share an island with a different country.
Source: Wikipedia
Non-Jetpunk recognized countries filled in by default
Not including river islands
External territories of countries marked in gold
Quiz by
capsmack123
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Last updated: January 8, 2026
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First submittedJuly 3, 2014
Times taken31,515
Average score76.0%
Rating4.94
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Island
%
Countries
New Guinea
59
Papua New Guinea
41
Indonesia
Borneo
73
Indonesia
26
Malaysia
1
Brunei
Ireland
83
Ireland
17
United Kingdom
Hispaniola
64
Dominican Republic
36
Haiti
Isla Grande de
Tierra del Fuego
61
Chile
39
Argentina
Timor
51
Indonesia
49
East Timor
Cyprus
58
Cyprus
35
Northern Cyprus
4
UN Buffer Zone
3
United Kingdom
Sebatik Island
55
Indonesia
45
Malaysia
Usedom
84
Germany
16
Poland
Saint Martin
59
France
41
Netherlands
Hans Island
60
Canada
40
Denmark
Kataja
85
Finland
15
Sweden
Passport Island
50
Bahrain
50
Saudi Arabia
K Island
60
Ukraine
40
Romania
Vanhasaari
?
Finland
?
Russia
Jähi
?
Finland
?
Russia
Unnamed island
southeast of Peräluot
?
Finland
?
Russia
Märket
55
Finland
45
Sweden
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40 Comments
+2
Level 60
Nov 21, 2020
Nice Quiz 5/5
+7
Level 72
May 16, 2024
Small typo in the description, it currently says "that share and island.."

Also, you should probably add a caveat stating that lake islands & river islands are not considered. Otherwise, this list gets a bit messier.

+7
Level 81
May 16, 2024
Spain and France share Pheasant Island too....

Wikipedia article

Although this is a river island, perhaps as cta127 says, add a caveat to not include river and lake islands.

+9
Level 81
Aug 8, 2024
Pheasant Island isn't actually split, though. It just swaps hands every six months.
+4
Level 87
May 16, 2024
Hans Island is 40% Canada, 60% Denmark.
+11
Level 99
May 16, 2024
It should be "Peräluoto" not "Peräluot".

Source: I'm Finnish.

+2
Level 80
Aug 8, 2024
Seconded.
+1
Level 81
May 16, 2024
Loved the quiz!
+1
Level 76
May 16, 2024
St Martin in France is not an "external territory" - it's an integral part of France proper.
+5
Level ∞
May 16, 2024
It's complicated.

https://en.wikipedia.org/wiki/Overseas_collectivity

+10
Level 86
May 17, 2024
Generally only overseas departments are considered a regular part of France
+2
Level 76
May 16, 2024
Jähi, according to googlemaps, is wholly within Finland. (As I'm in Helsinki at the moment, maybe I should go and take a look!)
+1
Level 60
Aug 29, 2025
The google maps map is very misleading there, I had to check for myself! But if you take the "street" view and look towards the Russian border, you can see one border marker near the other end of the island. And if you check the maps of the national landsurvey authority in Finland, you can see the correct border placement (the Russian part is tiny).
+2
Level 95
May 16, 2024
K Island is a river island. Never heard of it before mind…
+3
Level ∞
May 16, 2024
It's complicated.

https://en.wikipedia.org/wiki/K_Island

+3
Level 88
May 16, 2024
Fun. Love the included percentages.
+3
Level 81
May 16, 2024
Karaja is 85% Sweden and 15% Finland.
+1
Level 73
Aug 8, 2024
Agree, a big mistake
+1
Level 51
Aug 10, 2024
Kataja, yes
+9
Level 73
May 16, 2024
So does JetPunk recognize the border between Bahrain and Saudi Arabia or not? Because I always thought you didn't, but if you're recognizing the island as shared, then shouldn't there be a border? There's a guy who used to drive across that causeway once a week who would've told us all about how the McDonald's on the KSA side closes at prayer times but the McDonald's on the Bahrain side doesn't. Takes you back, man....
+9
Level 73
May 19, 2024
I also had to think about him when I saw Passport Island. :) Credit where credit is due, I wouldn't have known the answer if it wasn't for him.
+9
Level 93
Aug 8, 2024
I found the island on Google Maps. Apparently the restaurant on the Saudi side is a Burger King now?
+1
Level 49
Aug 8, 2024
i missed ireland
+1
Level 50
Aug 8, 2024
Very cool Quiz! Can i do a german Version of it?
+1
Level 66
Aug 8, 2024
Loved this quiz! But why aren't the errors pointed out in the comments taken on board? For example, Kataja definitely has more Swedish soil than Finnish.
+6
Level 87
Aug 8, 2024
Very minor correction, but the split of Hans Island is actually 60% in favour of Denmark, while Canada has the 40% share
+2
Level 87
Aug 10, 2024
It's already been pointed out. Apparently neither the quiz creator nor QM care.
+1
Level 75
Aug 8, 2024
Very nice quiz! Could Koiluoto also be a valid answer between Finlande and Russia?
+1
Level 41
Apr 19, 2025
dang, beat me to it. there's also a nearby (seemingly unnamed) island at 60°30'42"N 27°46'32"E that could be on the border.

found two more in lake Ylä-Tyrjä

found another one called Tarassiinsaari

russia-finland border has a lot of split islands in lakes

+1
Level 74
Aug 8, 2024
Ah, I have a similar quiz, but you have to guess the name of the island as well: https://www.jetpunk.com/user-quizzes/25526/islands-divided-between-several-countries
+1
Level 69
Aug 8, 2024
So sad K Island is not Korean :'(
+1
Level 79
Aug 8, 2024
Just missed Saudi Arabia and Bahrain, now I remember where that was from cuz I knew I learned about it before
+1
Level 40
Aug 9, 2024
Why isn’t there a hint for the third island?

EDIT: Nevermind, the island had the same name as the country. Could you put a hint like “Island near Great Britain” so that quiz takers don’t have to guess what island it is?

+3
Level 87
Aug 10, 2024
For an obscure island, maybe. Everyone should be able to come up with Ireland without a hint.
+1
Level 59
Sep 17, 2024
Northern Cyprus is not a country, Cyprus is the country, the north of Cyprus is illegally occupied by Turkey since 1974.
+2
Level 73
Nov 18, 2024
Great quiz. The profile picture of the quiz is English Harbor on Antigua though, which isn't a divided island, so you might want to change it to St. Martin to get the true purpose right.
+1
Level 42
Nov 21, 2024
why are ireland and cyprus answer while all other islands are not
+3
Level 42
Jan 26, 2025
Missing Martin Garcia Island between Argentina and Uruguay
+1
Level 62
Sep 5, 2025
So, Märket belongs to Åland which is an autonomous part of Finland. So shouldn't that be coloured? Just asking because of Greenland.
+1
Level 55
Dec 18, 2025
The unnamed island southeast of Peräluot is actually named Koiluoto so fix this.