[[quoteright:320:[[VideoGame/ValkyrieProfile http://static.tvtropes.org/pmwiki/pub/images/mucking_in_the_mud.jpg]]]]
[[caption-width-right:320:Gettin' dirty just to know the answer...]]

This is a common subtrope of GeoEffects, where boggy or swampy areas drastically impede your movement. So long as you remain in here, you'll move at a snail's pace, vulnerable to passing enemies. [[JumpPhysics Your jumping, if applicable, may or may not be affected by this, and in fact you may be able to move quickly by repeatedly jumping in and out of the bog.]]

In some cases the bog may actually [[GrimyWater be hazardous to your health,]] dealing damage over time, [[QuicksandSucks acting like quicksand and swallowing you whole if you spend too long within,]] or applying some unpleasant StandardStatusEffects.

For some reason, you're never able to simply ''walk around'' the hazardous terrain, as the area is almost uniformly flooded like this. Any safer paths will [[InsurmountableWaistHeightFence almost certainly be blocked off with fallen logs]], impassible treelines, and so on. However, some mudpits look hazardous, but are actually safe enough to cross...

Not to be confused with BubblegloopSwamp or QuicksandSucks.

See also SwampsAreEvil and GrimyWater. Oddly enough, rarely combined with MudWrestling.

* A very small bit of this was seemingly featured in the Episode "Training Daze" in ''{{Anime/Pokemon}} Chronicles''...

* {{Candyland}} has the Molasses Swamp, which causes anyone who lands on it to lose a turn.
** Also, dotted spaces called "cavities," which required a player be "stuck" until drawing a card with the same color as the dotted space they're currently on.

* In ''Literature/TheHoundOfTheBaskervilles'', the moor has the Grimpen Mire, which only Jack Stapleton knew how to cross safely. Another character who'd tried to traverse it was sucked down into its depths.
* OlderThanSteam: The Slough of Despond from ''Literature/PilgrimsProgress'' trapped unwary travelers unless Help came along.
* The River Ankh in ''Literature/{{Discworld}}'' is very slow and polluted, so it's really more of a swamp than a river. ''Discworld/TheTruth'' has this:
-->'''The Duck Man''': I used to mess about in boats when I were a boy.
-->'''Coffin Henry''': We could [[{{Spoonerism}} boat about in mess]].
* The Doldrums in ''Literature/ThePhantomTollbooth'' pose all the usual hazards of a sticky, goopy swamp, and top it all off with a LotusEaterMachine effect that mires minds as effectively as wheels.

* The UsefulNotes/NintendoDS game ''[[VideoGame/SummonNight Summon Night: Twin Age]]'' consists of around 60% different types of sinky stuff by volume, such as "Poison Marshes" and "Desert Quicksand".
* In the PC game ''VideoGame/PrincessMaker2'', there's an "adventure" event which has a few swamps where you can slog around. They're not really dangerous; they have hidden secret shortcuts in them, even.
* The Great Marsh and the southern part of nearby Route 212 in ''VideoGame/PokemonDiamondAndPearl''. The player character is greatly slowed down when he/she runs through the bog, and, in some places, he/she can even get stuck.
** The spinoff game ''VideoGame/PokemonDash'' has a few courses with muddy, swampy areas. These aren't particularly unique, however, as ''every'' terrain type except paved road reduces your speed.
* ''VideoGame/ValkyrieProfile: Lenneth'' has 2 places known, with mud, they are Nethov swamp and Salerno Academy, you can only find them on normal and hard mode.
* ''Super Mario Strikers Charged'' has a stage known as ''The Dump'' which is muddy.
* One of the special minigames had this feature in ''VideoGame/MarioParty 7''.
* The ''Franchise/{{Castlevania}}'' series has a couple of these. Perhaps most noteworthy is the poison swampy stuff in ''VideoGame/CastlevaniaIISimonsQuest''.
* Castor Wilds in ''VideoGame/TheLegendOfZeldaTheMinishCap'' consists of a quicksand-like marsh with safe zones in the form of raised land. Traversing it safely requires getting ahold of the Pegasus Shoes, which let you dash across before the muck can take hold.
* "Grail Mountain" with its purple puddles and "East Ghoss Forest" with its mud in ''VideoGame/GrandiaII''...
* One area in ''VideoGame/ZeldaIITheAdventureOfLink'' is a thick marsh. You'll move more slowly both on the overworld and in battle sequences, though your enemies are, of course, completely unaffected.
* ''VideoGame/MetalGearSolid3SnakeEater'' has pools of mud like this. If the mud is deep enough, Snake will eventually sink to his death. What's more, the mud houses leeches which will cling to Snake and sap his stamina.
* ''VideoGame/OnePieceUnlimitedCruise: Episode 2'' had "Boggy Isle" with this feature...
* ''VideoGame/LufiaRuinsOfLore'' had Jungle Spire which have mud spots that take you down to a cave area if you step in the right areas...
* The swamp level in ''VideoGame/{{Turok}} 2'' has regular mud that slows you down, and quicksand that [[QuicksandSucks instantly sucks you down]].
* Although it's technically more of a swamp, both ''VideoGame/DemonsSouls'' and ''VideoGame/DarkSouls'' feature this, complete with reduced mobility and absence of rolling. In both games, the swamp is also poisonous, so staying in it for long isn't exactly advisable. In the first game, swamp jellyfishes that live in it can be killed to provide anti-poison herbs, but the absence of rolling is lethal since any other enemies [[TheComputerIsACheatingBastard can cross the swamp with nary a hitch]], unlike you. In the second game, the enemies that live on it can still charge at you at maximum speed, but an equippable ring exists so that movement penalties are removed entirely when walking on swamps. Oh, and fast rolling (<25% equip burden, or Dark Wood Grain Ring ninja flip) is not disabled in the swamp.
* Some of the jungle levels and one south pacific level in ''VideoGame/TombRaiderIII'' have mud that makes Lara sink if she steps in it. In some spots, the mud is deep enough to make Lara be completely submerged and she will quickly drown.
* ''Xenoblade Chronicles'' has poisonous swamp water in Satorl Marsh.
* Water in ''VideoGame/Left4Dead2'' reduces the survivor's running speed, though not the Infected's. The "Swamp Fever" campaign has this trope as one of its highlights, given [[BubblegloopSwamp the campaign's setting]], as does "Hard Rain".
* The "negative cover" system in VideoGame/DawnOfWar usually consists of swampy or at least flooded terrain. In normal cover, units move slower but take less damage, here they move slower and take ''more'' damage.
* In ''VideoGame/WorldOfTanks'', different types of terrain offer different degrees of resistance to tank treads. Naturally, swampy ground or bodies of water make tanks move very slowly.
* Jungles are the worst possible terrain for any kind of divisions in ''VideoGame/HeartsOfIronII''. Armoured divisions barely make any progress at all, all troop types suffer massive penalties and on top of that they can easily start shrinking due to attrition if your supply lines and techs aren't on par. Marshes are almost as bad, but at least there's usually no attrition and Marine divisions suffer less penalties to combat and movement.
* In the ''VideoGame/HeroesOfMightAndMagic'' series, swamp terrain drastically slows down army movement, unless the army is composed entirely of creatures native to that terrain type. This can be mitigated by sticking to roads... when there ''are'' roads.
* ''VideoGame/GoldenSunTheLostAge'':
** Taopo Swamp: The actual swamp is only one screen, but it's so thick that you can ''stand'' on it, only sinking when you move forward (and standing on bubbles brings you back to the surface).
** The Djinni Mud reduces foes' agility by... throwing mud at them.

* In ''VideoGame/GretelAndHansel 2'', Gretel can wade around the swamp but can't get across completely without her brother's help because of a snake that lurks halfway across.

[[folder:Web Original]]
* ''Roleplay/STOForumVersusThreadRP'': Eleya and Kang materialize in a swamp, and join forces after she gets stuck in the mud and he runs across her and rescues her.

* ''WesternAnimation/AdventuresFromTheBookOfVirtues''
** In the episode "Self-Discipline," Annie and Zach were walking on mud while they enter Plato's Peak.
** In one scene of the episode "Moderation", Socrates is seen stepping in a puddle of mud, much to Aristotle's annoyance.
* ''WesternAnimation/MrBogus'':
** In the first act of the episode "[[Recap/MrBogusS2E5BadLuckBogus Bad Luck Bogus]]", Bogus and Brattus both fall into a mud puddle in the front yard of the Anybody residence.
** Bogus falls in a mud puddle during his first day of military training in the first act of the episode "[[Recap/MrBogusS3E5BattleActionBogus Battle Action Bogus]]".
* The animated film version of ''WesternAnimation/ThePhantomTollbooth'' also shows the Doldrums, a swamp that it's too easy to get mired down in both literally and figuratively. At first Milo's car just gets stuck, but as he starts to succumb to the effect the thing seems to be starting to ''melt''.

* In both the Napoleonic and German invasions of Russia, the Rasputitsa (Russian for "quagmire", literally "time when roads cease to exist") bogged down armies so much that there was practically no fighting for 6 weeks in the spring and fall.
* The Battle of Passchendaele, from World War I. Heavy rains and silty, muddy terrain made this battle a symbol of soldiers' suffering.
* This was a major factor in the outcome of the Battle of Agincourt during the Hundred Years' War, with heavier-armored french troops getting bogged down by a muddy battlefield.