|literal english=Earth Release: Swamp of the Underworld
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|english tv=Earth Style: Dark Swamp
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|jutsu rank=A
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|jutsu classification=Ninjutsu
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|jutsu type=Earth Release
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|jutsu class type=Offensive
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|jutsu range=Short, Mid, Long
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|users=Jiraiya
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|hand signs=Boar, Tiger
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|debut manga=166
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|debut anime=94
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|debut shippuden=No
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|game debut=Naruto: Gekitō Ninja Taisen! 3
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|jutsu media=Anime, Manga, Game
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}}
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By changing the surface of an object beneath an enemy into mud and creating a swamp, the user can sink his enemy into the mud. The adhesive, chakra-infused mud ensnares the enemy's body, making it almost impossible to recover one's strength and escape from the swamp. The size and depth of the created swamp depends on the user's skill and the amount of chakra used, but if the user is an expert in this technique, it will always be possible to make a fair-sized swamp which is extremely effective against a great number of enemies or when having to face gigantic creatures.<ref>''Naruto'' chapter 166, page 7</ref>
By changing the surface of an object beneath an enemy into mud and creating a swamp, the user can sink his enemy into the mud. The adhesive, chakra-infused mud ensnares the enemy's body, making it almost impossible to recover one's strength and escape from the swamp. The size and depth of the created swamp depends on the user's skill and the amount of chakra used, but if the user is an expert in this technique, it will always be possible to make a fair-sized swamp which is extremely effective against a great number of enemies or when having to face gigantic creatures.[2]