One of the most detailed locations outside of the Rock of Bral itself is the Arcane trade world of Refuge, located in a small sphere near Realmspace. Originally described by Ed Greenwood in Dragon #159, it is a great addition to any sphere-spanning campaign. Quite some time ago, I decided to make a simple starchart for the sphere, modeled after the starchart for Pirtelspace in Dungeon #36.
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Wildspace: The Spelljammer Fanzine 