General Zaroff describes the Death Swamp as filled with quicksand. When Rainsford encounters the swamp, he finds it filled with rank, dense plants and insects that bite him mercilessly. As he takes a step, his foot sinks into the ooze, and he feels that it sucks him in like a leech. He can only retract his foot with great difficulty. The swamp is surrounded by weeds and branches and by a lightning-scarred tree. The earth in the swamp is so soft that Rainsford can easily dig a pit in the swamp. The swamp is silent until Rainsford hears General Zaroff approaching, and Rainsford can easily conceal himself near the swamp, as it is surrounded by a dense canopy of trees and by a great deal of vegetation.
In the short story "The Most Dangerous Game," there are six references to the word "swamp." This shows that the swamp is an important part of the playing field of the most dangerous game. The general calls it death swamp for good reason. It is located in the southeastern corner of the island and there is powerful quick sand there that can easily take a person's life. Here is the advice that the general gives:
I suggest, too, that you avoid the big swamp in the southeast corner of the island. We call it Death Swamp. There's quicksand there. One foolish fellow tried it.
That the place is dangerous is confirmed, as the general says that one of his best hounds, Lazarus, died in the swamp.
Later on, Rainsford ran away to that part of the island, and he nearly died in the quicksand. Only with considerable effort was he able to get his feet out of the quicksand. Rainsford described the quicksand as a giant leech sucking him in.