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It is located at the southern end of the desert area on the Wonder Map
The player and their partner are sent here in search of Grovyle, who is, at that point, believed to be a wanted criminal and thief.
At the end of the dungeon is a series of quicksand pits. During the first visit, the player and their partner head back after reaching the quicksand, but they return the next day and jump in the quicksand, which leads to Quicksand Cave and the Underground Lake.
After the credits, the player can continue their journey in Quicksand Cave after completing Northern Desert.