[prennert]

"continuous expanse of land" would imply at least that any island is its own continent, but perhaps even that each bank of any river (while water is in it) would divide continents. So that does not seem right.

Wikipedia actually contradicts you in the first two sentences in the "Continent" entry [0]:

> A continent is any of several large geographical regions. Continents are generally identified by convention rather than any strict criteria.

[0]: https://en.wikipedia.org/wiki/Continent

[frosted-flakes]

An island is not an expanse of land, and the presence of a river doesn't make an expanse of land discontinuous.

[prennert]

Greenland and Madagascar would disagree. But yes on second thought, you are correct with the river.

[CRConrad]

> An island is not an expanse of land

Sez who (and why)?