Trollworld (aka Kaball) is the default setting for Ken St. Andre's Tunnels & Trolls. As with certain other settings, the designer paints in broad strokes, particularly in earlier iterations of the setting—he encourages the user of the setting to make it his own.
from A Fragmentary History of Trollworld:
…Trollworld–my home setting for Tunnels and Trolls–is such a world. A world, even an imaginary world, is a vast thing—a potentially infinite thing. Every person can look at Trollworld differently, and they can all be right.
Then there was the map of the whole world in the 7th edition from Fiery Dragon. I never liked that. It was commissioned by Jim Shipman, and it’s his world of Kaball, not my Trollworld. It’s most notable because it got published on cloth with the 7th edition, but it has all the cities in the wrong places.