Greyhawk 20 And 30 Mile Hexes

Here's Darlene's original map for the World of Greyhawk. These hexes are 30 miles across. Note that Gygax is said to have invented this version of Oerth and the Flaeness for publication - his original campaign grew from the environs of Greyhawk Castle outward rather than being a top-down vision from the start.

Here's a later TSR map detailing a smaller area of that map (Admundfort is visible in each) using 20 mile hexes, which doesn't fit any kind of system (perhaps because hex-crawl campaigns were already being forgotten?). Nevertheless, this is useful for showing the kinds of details that are hidden in 30 mile hexes but revealed by just a little zooming in.