Landmasses with an International Border

Can you name all landmasses with an International Border?
Overseas territories are included, but not heavily disputed ones such as ones in Antarctica.
It must be the largest landmass with the border between those two countries. So for example, Chile and Argentina have a border on Tierra del Fuego, but because they also have a border on a larger landmass Tierra del Fuego is not included.
Not counting artificial islands or very small islands in causeways
Quiz by TWM03
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Last updated: August 10, 2018
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First submittedApril 11, 2018
Times taken57
Average score77.8%
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Countries
Landmass
Numerous
Afro-Eurasia
Numerous
Americas
Indonesia, Papua New Guinea
New Guinea
Indonesia, Malaysia; Malaysia, Brunei
Borneo
United Kingdom, Ireland
Ireland
Countries
Landmass
Dominican Republic, Haiti
Hispaniola
Indonesia, East Timor
Timor
United Kingdom (Akrotiri and Dhekelia) , Cyprus
Cyprus
France, Netherlands
St Martin
+1
Level 76
Apr 11, 2018
Nice! Any thoughts on the 'dubious' India-Sri Lanka border?
+2
Level 70
Apr 11, 2018
If it exists that means that Sri Lanka is actually just a part of the Afro-Eurasia landmass. Then it would come under Afro-Eurasia. Alternative definitions may put some sort of border in the "very small islands" category.
+1
Level 57
Feb 4, 2023
Now that Hans island is split between Canada and Denmark, Hans Island is the smallest landmass in the world with an international border!
+1
Level 77
Sep 29, 2023
You've missed a couple. Tierra del Fuego (full name Isla Grande de TdF) and the Baltic island of Usedom, whose border I crossed last year (Germany-Poland).