The article "Underground" in GURPS All-Star Jam 2004 suggests a Flat Earth, where the sky constitutes the ceiling & walls. This would work well for a world based upon a traditional mythology.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.