357
Planet Definitions
(xkcd.com)
Comic Strips is a community for those who love comic stories.
The rules are simple:
Web of links
What is "surface"?
Also, what is "landed"? And why is Jupiter out?
In this context, I believe this is limiting to planets whose water is not deep inside the planet's crust somewhere, but exposed to its atmosphere.
Ok, but the gas giants should have that. We just can't see them.
Unless you want pure water. But then, how pure?