ccs
41st lv DM
Well, you're not wrong....
(The info below can be found here: The Keep on the Borderlands - Wikipedia)
Wikki: When The Grand Duchy of Karameikos edition of the Gazetteer series was published, the Keep was given a specific location in the Known World of Mystara, in the Atlan Tepe Mountain region in northern Karameikos.
Wikki: A sequel was released in 1999, Return to the Keep on the Borderlands for 2nd edition AD&D. The original B2 publication was generic in terms of setting, while the 1999 Return module placed the Keep in Yeomanry, making it a canonical location in the World of Greyhawk. The placement of the Keep in Greyhawk did not match many details in the sequel, such as several non-Greyhawk deities, nations, and peoples. At least two of the non-player character descriptions refer to details from the Mystara setting rather than Greyhawk.
Wikki: In September 2010, the module was re-released for D&D 4th Edition by Wizards of the Coast for use in the weekly D&D Encounters sessions. Like the original, this revised module was designed for use with the contemporaneously released Dungeons & Dragons Fantasy Roleplaying Game boxed set for D&D Essentials, which is oriented towards the beginning player. This time, The Keep on the Borderlands is set in the D&D base world of the Nentir Vale, in an area known as the Chaos Scar.
There's also the 2001 novel that's set in Greyhawk.
Once again, not wrong....
(See: The Isle of Dread - Wikipedia)
Wikki: The adventure was loosely based on King Kong,[1] and came with a fairly detailed (for its time) map of a setting then called the Known World,[1] showing at least fifteen distinct nations on the mainland to the north, as well as much of the Sea of Dread in which the Isle of Dread could be found.[4] These nations each received a paragraph or so of description near the beginning of the module.
The Sea of Dread is due south from Ierendi & The Minrothad Guilds. The Isle is part of an archipelago of islands, the name of wich escapes me.
In other works (Again, see:The Isle of Dread - Wikipedia)
Wikki: The Isle is also a minor encounter area in the later adventure Lathan's Gold,[13] and receives some further mention in several later D&D products such as the Poor Wizard's Almanac series.
Wikki: Issue No. 114 of Dungeon magazine features an update on the Isle of Dread as a Greyhawk setting, a remake-sequel to The Isle of Dread entitled Torrents of Dread,[14] and a poster-style map of the island, as well some smaller surrounding islands.[4]
Wikki: In this update, the island was located in the Densac Gulf, a region bordered by the Azure Sea to the north, the Pearl Sea to the south, the Amedio Jungle to the west, and Hepmonaland to the east. This large expanse of ocean contains several island chains, one of which is the Isle of Dread itself. The update details a kopru plot that destroyed the city of the original Olman settlers through the power of a giant black pearl imbued with the influence of Demogorgon, the demonic god of the kopru. The isle has become a mad collection of kopru, other aquatic races, demonic beings, dinosaurs, and savage Olman natives.[15]
Wikki: In the announcement for Dungeon's Savage Tide Adventure Path, Erik Mona mentioned that the Isle will be prominently featured in Savage Tide. Though most place names and other such references will be to the World of Greyhawk setting, Mona has stated that there will also be a number of Mystara references, in something of an homage to the Isle's roots.
Wikki: The first Savage Tide adventure set on the Isle of Dread is "Here There Be Monsters", found in Dungeon No. 142 (January 2007). The Isle of Dread remains the setting for the next three adventures: "Tides of Dread," in issue No. 143; "The Lightless Depths," in issue No. 144; and "City of Broken Idols," in issue No. 145.
Wikki: The D&D 4th edition supplement Manual of the Planes (2008) establishes the Isle of Dread as a location in the Feywild (a parallel plane dominated by faeries and unspoiled natural life) as part of its general reorganisation of the D&D cosmos.
Wikki: The D&D 5th edition Dungeon Master Guide (2014) places the Isle of Dread in the Plane of Water, though it mentions that the island has the ability to appear in the Material Plane.[16]
That Isle of Dread sure gets around.
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And that's not even considering how many homebrews it's appeared in over the decades!