Plains of Ruin
"The Plains of Ruin and the marshes surrounding the Swamp Palace were populated with several kinds of evil creatures."
The Plains of Ruin is a region of the Dark World in A Link to the Past. It is located south of the Pyramid of Power and spans the Dark World counterparts of the Great Swamp and the Haunted Grove. After acquiring the Magic Hammer, Link can access the region by heading south from the Pyramid or via a Warp Tile located in the far left corner of the Great Swamp.