In some cases, this figure is approximate and may vary slightly between sources depending on which islands are counted.
The criteria for inclusion appear to differ considerably between the countries so they are not necessarily directly comparable.
Some islands are fully submerged by the tides at times, and those may also not be counted by some countries while others do.
Where counts vary, this article uses the highest reliably sourced figure.
For the purposes of this article, the top 50 countries will have their islands determined by the following definition: “An island is a land mass permanently above sea level either in an inland waterway or in the open sea.