Swamp Hills

This article describes content that has been officially made unobtainable in Bedrock Edition.

It can still be obtained using third-party software. However, this can cause unexpected behavior such as bugs and crashes.

This page describes content that has been removed from Java Edition.

This feature was present in earlier versions of Java Edition, but has since been removed.

The swamp hills or swampland mutated biome is a rare variant of the swamp that no longer generates since Caves & Cliffs: Part II, and was removed in Java Edition.

Description

Old

The swamp hills featured hillier terrain rising up between the flat marshes. These hills would tower over the otherwise low-elevation swamp, with some large areas at high elevation without any water. Additionally, flooded areas in swamp hills tended to reach lower depths than the rest of the swamp, sometimes deep enough to have a gravel floor in place of a dirt floor, like normal oceans. Swamp huts‌^{[Bedrock Edition only]} and fossils generated, and slimes spawned more frequently. Additionally, seagrass did not generate in flooded areas of swamp hills. If it connected to a jungle it had a chance to create a modified jungle edge biome.

The swamp hills had the same vegetation as the regular swamp, with swamp oaks, lily pads, blue orchids, mushrooms, and huge mushrooms.‌^{[Bedrock Edition only]}

Although this biome is called 'swamp hills', it did not actually generate as a 'hills' variant, but as a 'modified' variant of the swamp, making it slightly rarer.

Current

In Bedrock Edition, swamp hills in older worlds still received updates. When generated through single biome or behavior packs, they can also generate new blocks.

They look similar to regular swamps, with patches of firefly bushes and more sugar cane. Frogs can also spawn at daytime, while bogged spawn during the night.

With Vibrant Visuals, swamp hills have a unique brown-green sky color, and stronger volumetric fog effects, fading the sun and sunlight.

Mobs

Swamp hills use the same mob spawning chances as regular swamps.

The following mobs spawn naturally here:

In **Java Edition**
Mob	Spawn weight	Group size
Creature category
Sheep	¹²⁄₄₀	4
Pig	¹⁰⁄₄₀	4
Chicken	¹⁰⁄₄₀	4
Cow	⁸⁄₄₀	4
Monster category
Spider	¹⁰⁰⁄₅₁₆	4
Zombie	⁹⁵⁄₅₁₆	4
Zombie Villager	⁵⁄₅₁₆	1
Skeleton	¹⁰⁰⁄₅₁₆	4
Creeper	¹⁰⁰⁄₅₁₆	4
Slime^{[note 1]}	¹⁰⁰⁄₅₁₆	4
Enderman	¹⁰⁄₅₁₆	1–4
Witch	⁵⁄₅₁₆	1
Slime^{[note 1]}	¹⁄₅₁₆	1
Ambient category
Bat	1	8

↑ ^a ^b Spawning is greatly affected by moon phase

In **Bedrock Edition**
Mob	Spawn weight	Group size
Monster category
Creeper	100	1
Slime^{[note 1]}	100	1
Spider	100	1
Zombie	95	4
Skeleton	80	2
Bogged	50	4
Enderman	10	2–3
Witch	5	1
Zombie Villager	5	4
Creature category
Sheep	12	2–3
Chicken	10	2–4
Frog	10	2–5
Glow Squid	10	2–4
Pig	10	1–3
Cow	8	2–3
Ambient category
Bat	1	2

↑ Slimes are spawned once, for both slime chunks and the surface.

Sounds

Music

These music tracks play while the player is in the swamp hills.

Filename in Minecraft	Gameplay	Soundtrack Title	Soundtrack	Weight
aerie.ogg	Lush Caves, Forest, Dark Forest, Birch Forest, Old Growth Birch Forest, Jungle, Swamp, Old Growth Taiga	"Aerie"	Minecraft: The Wild Update (Original Game Soundtrack) No. 2	1
firebugs.ogg	Lush Caves, Forest, Dark Forest, Birch Forest, Old Growth Birch Forest, Jungle, Swamp, Old Growth Taiga	"Firebugs"	Minecraft: The Wild Update (Original Game Soundtrack) No. 1	1
labyrinthine.ogg	Lush Caves, Forest, Dark Forest, Birch Forest, Old Growth Birch Forest, Jungle, Swamp, Old Growth Taiga	"Labyrinthine"	Minecraft: The Wild Update (Original Game Soundtrack) No. 3	1

Data values

ID

Bedrock Edition:

Name	Identifier	Numeric ID
[No displayed name]	`swampland_mutated`	`134`

History

Java Edition

Java Edition
1.7.2	13w36a	Swampland M variant added, along with many other biomes. Its grass color now varies.
1.7.2	13w38b	Marsh-like areas and dead bushes no longer generate in swamp biomes.
1.8	14w26a	Marsh-like areas and dead bushes generate in swamp biomes again.
1.10	16w20a	Added fossils, which can generate in swamps.
1.13	18w14a	Seagrass now generates in swamps.
	18w15a	Changed the tint of water in the swamp biomes from blue to gray to match Bedrock Edition. However, swamp M still uses the same tint, resulting in chlorine-colored water.
	18w16a	"Swampland M" has been renamed to "Mutated Swampland".
	18w19a	"Mutated Swampland" has been renamed to "Swamp Hills".
	pre3	Swamp hills now use the correct water color.
September 28, 2019		During MINECON Live 2019, the swamp came in second place in the Biome Vote; mangrove trees, boats with chests, and frogs would be added.
1.14	18w43a	Drowned no longer spawn in swamps.
1.18	Experimental Snapshot 1	Swamp hills no longer generate naturally.
1.18	21w40a	The swamp hills biome has been removed.

Bedrock Edition

Pocket Edition Alpha
v0.9.0	build 1	Added swamp hills, along with many other biomes.
v0.10.0	build 1	The water in swamp hills is now tinted dark gray.
v0.10.0	build 1	Huge mushrooms now generate in swamp hills.
v0.13.0	build 1	Marsh-like areas no longer generate in swamp hills.
?	?	Marsh-like areas generate once again in swamp hills.
v0.14.0	build 1	Added witch huts, which generate in swamp hills.
Pocket Edition
1.1.3	alpha 1.1.3.0	Added fossils, which generate in swamp hills.
Bedrock Edition
1.2.13	beta 1.2.13.8	Added drowned, which can spawn in swamp hills.
1.10.0	beta 1.10.0.3	Drowned no longer spawn in swamp hills during the day.
1.18.0	beta 1.18.0.22	Swamp hills no longer generate naturally.
1.18.10 Experiment Wild Update	beta 1.18.10.24	Added frogs, which spawn in swamp hills.
1.20.70 Experiment Update 1.21	Preview 1.20.70.24	Bogged now spawn in swamp hills.
1.21.60	Preview 1.21.60.23	Blue orchids now generate more frequently and in larger patches.
		Swamp oaks now generate slightly more frequently.
		Swamp oaks no longer generate in direct contact with the ground.
		Lily pads now generate more frequently.
1.21.70 Experiment Drop 1 2025	Preview 1.21.70.20	Added firefly bushes, which can generate in swamp hills.
1.21.90	Preview 1.21.90.26	Added unique green atmospherics and strong volumetric fog to swamp hills in Vibrant Visuals.
1.21.100	Preview 1.21.100.20	Mushrooms now properly generate under trees.

Legacy Console Edition

Legacy Console Edition
Xbox 360	Xbox One	PS3	PS4	PS Vita	Wii U	Switch
TU31	CU19	1.22	1.22	1.22	Patch 3		Added Swampland M variant.
TU31	CU19	1.22	1.22	1.22	Patch 3		Generation of marsh-like areas in swamp biomes has been changed.
TU43	CU33	1.36	1.36	1.36	Patch 13		Added fossils, which can generate in swamps.

Data history

Java Edition
1.13			pre5				The ID `mutated_swampland` has been changed to `swamp_hills`.
1.18			21w37a				Prior to the removal of numerical biome IDs, this biome's numerical ID was 134.

Issues

Issues relating to "Swampland Mutated" are maintained on the bug tracker. Issues should be reported and viewed there.

Gallery

A swamp hills biome in Bedrock Edition. There is no water visible here.
A swamp hut generated in a swamp hills biome in Bedrock Edition.
An overhang generated in a swamp hills.
A swamp hills biome generated next to a modified jungle edge.
Swamp hills in Java Edition
A swamp hills next to a river
A swamp hills single biome world.
An example of the temperature variation in swamps, leading to different shades of green for the grass blocks.
Same as the previous image, edited for better visibility.
Swamp hills with ray tracing