The Quagmire Cave (formally the Swamp Cave) is a dungeon which connects north and south eastern Alefgard. The dungeon has 1 entrance on each continent. It is one of only a few places which is accessible in the original Dragon Quest trilogy.
The Quagmire Cave serves no real purpose in the game due to the fact that by the time the hero's party can access it, they already have a ship which eliminates the need to enter the cave.
Additionally, the cave has been downsized to a simple straight corridor with no treasure inside.
The Quagmire Cave is not fully completed during the time period of the game. Inside the north entrance, the hero's party can visit several workers who are busy completing its excavation.
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Cave to Rendarak • Charlock Castle • Dragon's Horns • Gwaelin's Gate • Hall of Hargon • Lake Cave • Lighthouse • Pillar of Winds • Quagmire Cave • Sea Cave • Tower of the Moon • Wellspring of the Hero
5 Sigils • Celestial skein • Echoing Flute • Eye of Rubiss • False idol • Golden key • Jailor's key • Moonshard • Ra's mirror • Ship • Silver key • Subtle shuttle • Sunken treasure • Teleportal • Floodgate key • Windbreaker • Yggdrasil leaf