Quagmire!
TSR, Inc.
 In the beginning of this adventure, the player characters set off in search of the city of Quagmire. The characters must travel through a monster-infested swamp to get to the city, which is being slowly swallowed into the sea. Quagmire is a whelk-shaped "spiral city", built by a dead race in the Serpent Peninsula. The module includes a description of the city.