Recursive islands and lakes

[1] For the purposes of defining recursion, small continental land masses such as Madagascar and New Zealand count as islands, while large continental land masses do not.

Islands found within lakes in these countries are often recursive islands because the lake itself is located on an island.

[6] (km2) Moose Boulder was claimed to exist in the seasonal pond of Moose Flats on Ryan Island in Siskiwit Lake on Isle Royale in Lake Superior in the United States.

[20] In 2020, an expedition to the island found that it is potentially a hoax, along with the aforementioned seasonal pond.

The 4th grade recursion lakes are incredibly rare.