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