A campaign setting for Basic D&D that appeared in some articles in Imagine magazine, TSR's UK office's official magazine, which mostly reprinted articles from the US Dragon magazine, but also included some new stuff.
The world is flat. Otherwise, it's pretty generic, if well defined. Fondly remembered by British neckbeards, all but unknown to the rest of the world. Someone hacked together a single document with all of the content.
|Dungeons & Dragons Campaign Settings|
|Basic D&D:||Mystara (Blackmoor) - Pelinore|
|AD&D:||Birthright - Council of Wyrms - Dark Sun - Dragonlance |
Forgotten Realms (Al-Qadim - The Horde - Icewind Dale - Kara-Tur - Maztica)
Greyhawk - Jakandor - Mystara (Hollow World - Red Steel - Savage Coast)
Planescape - Ravenloft (Masque of the Red Death) - Spelljammer
|3rd/3.5 Edition:|| Blackmoor - Dragonlance - Eberron - Forgotten Realms |
Ghostwalk - Greyhawk (Sundered Empire) - Ravenloft
|4th Edition:||Blackmoor - Dark Sun - Eberron - Forgotten Realms - Nentir Vale|
|5th Edition:|| Dragonlance - Eberron - Forgotten Realms - Greyhawk |
Nentir Vale - Ravenloft - Ravnica - Spelljammer
|Third Party:|| Dragonmech (3E) - Dragonstar (3E) - Kingdoms of Kalamar (2E/3E/4E) |
Midnight (3E/4E) - Ptolus (3E) - Scarred Lands (3E/5E) - Spellslinger (3E)
Wilderlands of High Fantasy (Basic)