I thought that desert islands, and indeed any island, just floated on the surface of the sea without moving. In other words it just bobbed there, rather than being connected to the sea bed in any way.
A childhood belief about landscape

others believed things like this
- I thought the Virgin Islands were owned by Richard Branson until I was 24. — LJ
- I thought that islands and continents were floating rocks so you could swim underneath them.— Kat
- When I was about 4 and I saw the clouds moving sideways, I thought that Earth was moving closer to the Sun— Helen
- I used to believe that human lived inside the planet earth and not on its surface.— Giancarlo
- i used to believe that the white foam on the surface of the ocean were unicorns trying to escape.— intunedwithmagic
- I used to believe that when I saw the clouds moving in the sky, that it was actually the earth moving. — Megan Gilbert