Caer Darrow is a keep (now ruined) on the Isle of Darrow, located on Darrowmere Lake in the Western Plaguelands. In the middle of Darrowmere Lake is a solitary island: the Isle of Darrow. "The keep of Caer Darrow, perhaps the oldest human monument in the world, stands upon this isle. The keep’s defenders abandoned it during the Third War." The ruin may hold many wonders, but unforturtunately it crawls with undead and their few remaining demonic allies, including at least three dreadlords. (LoC 95)