The World of Terraria consists of many different types of Environments, also known as Biomes contained within Layers. These environments are characterized by unique enemy spawns, block formation, loot tables, and oftentimes a background.
- For a list of all pages pertaining to environments, see Category:Biomes.
The sky is the area above the world. Most notably, it is the area in which Floating Islands are found, along with Harpies and, in Hardmode, Wyverns. At very high altitudes, near the world's upper boundary, the background changes to a black, starry scene and gravity is greatly reduced. This area is referred to as space.Skybridges are commonly constructed at high altitudes for fast travel around the world.
Slimes and at night - Zombies and Demon Eyes. If it's corrupted, hallowed, or crimsoned, the mobs that normally spawn at the surface will also spawn. You can also place blocks onto the background without needing to connect them to other blocks. Brown Chests are found most often here with very low powered loot.
- Image desired
- Image desired
- Main article: The Underworld
The Underworld, also known as Hell, Hades Land, or the home of the lava is a hellish realm (about 3500 Feet below on Large maps and 1700 on Small ones) that can be reached by digging past the stone layer. It is very easily identified by its background of stone with veins of Lava. It is primarily made of Hellstone ore deposits surrounded by Ash Blocks, with extensive pools of Lava. Chests with unique loot can be found here. The chests in the underworld are mainly Shadow Chests and require a Shadow Key to open. Hellstone can be used to make molten tools and armor.The Wall of Flesh is a boss that can be summoned by tossing a Guide Voodoo Doll (From a Voodoo Demon you killed) into one of the many pools of lava within the Underworld. Defeating it will activate Hard Mode for your world. After killing the WoF, it is possible to have the underworld become infected by the spreading biomes, the Corruption, Hallow or Crimson. The background color change indicates this. The Wall of Flesh must be beaten for any of these to occur, unless you bring biome-making tools from another world that has Hard Mode on.
The Purity(Previously known as 'forest') is composed mainly of Dirt Blocks and Trees, and occupy most of the surface. Enemies that spawn in the Purity are relatively weak, making the biome a good starting point for most players. It is also the spawn point for most worlds, as this biome is closer to the center, while other environments take the spaces closer to the edge. Also occasionally rain will happen in the biome. There is also a probability of storms during the rain.
- Main article: Desert
Deserts are large areas consisting of Sand Blocks that are always generated in a new world. Two types of plants exist in the Desert: Cactus and Waterleaf, both of which are used in alchemy. The Desert is useful if you want to craft a large amount of Glass or the Sandgun. Pyramids will spawn in any desert where there is sufficient sand to contain one. One world can have multiple Deserts and Pyramids.
There are generally no chests here, except in pyramids.
- Main article: Underground Desert
- Main article: Ocean
Oceans are large bodies of Water that spawn on both ends of the map with large beaches of sand. They are the only place you can find Coral. Monsters in the ocean include Sharks, Crabs, Squid and Pink Jellyfish and have a chance to drop the Pirate Map if Hard Mode is activated.
- Main article: The Corruption
The Corruption forms during the creation of a map at a random position. In most cases there are 2 to 4 Corruptions per map. This biome has a chance to replace the Crimson entirely, making it impossible to have both of them without the Clentaminator. The Corruption spawns higher-level monsters regardless of time and thus should initially be avoided by low-level players. Shadow Orbs can be found here in deep caves called chasms. These chasms can reach all the way to the stone layer. If you happen to have Corrupt Seeds, you can create your own Corruption. Odd thorn-like bushes will grow here. Avoid these, as they will do damage.
While Corruption is initially restricted to spreading through grassy Dirt Blocks, once the Wall of Flesh is defeated, the Corruption will begin to spread through Stone, Sand, Snow, Ice, and Mud Blocks at an advanced rate. Corruption that spreads to Mud turns the blocks into Dirt.
- Main article: Underground Corruption
The Underground Corruption occurs when the Corruption spreads through the underground layer. Souls of Night are a resource unique to this biome when Hard Mode has been activated. While you can create this biome while not in Hardmode and Corruption can be naturally generated at underground level on world generation, the biome will not spawn any special mobs until the map becomes Hardmode.
- Main article: Corrupted Desert
- Main article: The Crimson
- Main article: The Hallow
The Hallow is a magic-themed biome, and can be considered the antithesis of the Corruption. Hallowed ground will generate after the Wall of Flesh has been defeated and Hard Mode is unlocked. It will spawn on the opposite of the Corruption, and may even replace corrupted blocks. Like the Corruption, the Hallow can spread across dirt, stone, and sand, though unlike the Corruption, it cannot spread through mud.
- Main article: Hallowed Desert
This biome is formed naturally when the Hallow transforms sand blocks into Pearlsand Blocks.
- Main article: Hallowed Snow Biome
This biome is formed naturally when the Hallow transforms ice blocks into Pink Ice Blocks.
- Main article: Underground Hallow
The Jungle is a biome that exists both above ground and underground. It is usually located far away from the spawn point, at the opposite end from the Dungeon. Surface Jungle
- Main article: Surface Jungle
The Surface Jungle is a tree-filled biome containing decorative vines. The trees here grow without the need to plant Acorns, as long as there is Jungle Grass present. The Surface Jungle typically directly connects to the Underground Jungle. This Biome was added in the PC 1.0.4 update. Like most other biomes, the Surface Jungle has its own music. The Jungle is certainly less dangerous than the Underground Jungle, and yields Chest(s). However, it can still prove to be difficult for newer players because of the mobs.
- Main article: Underground Jungle
- Main article: Snow Biome
- Main article: Dungeon
There is only one Dungeon in each World, although a player may create new Worlds and plunder the Dungeons to gain additional items. Rarely, the Dungeon can get cut off by the ocean and only have the Old Man. Digging down through the sand can most often reveal the buried Dungeon.The Dungeon's upper level is home to an Old Man, which will turn into Skeletron should the player talk to him at night, or summon a Dungeon Guardian if the player attempts to enter the dungeon without killing him first.
The Glowing Mushroom Biome is in the stone layer of the world. Dart Traps seem to be more common here, with the usually being one or more per biome. Breaking the glowing mushrooms or the giant glowing mushrooms may yield some mushroom grass seeds.In the new 1.2 update, this biome can also be found and possibly generated over-world. The planted mushroom grass does grow above sea level but at much slower pace. This Surface Glowing Mushroom Biome has slightly different trees and is required for the NPC, Truffle.
- Main article: Meteorite
- Main article: Graveyard
- Main article: Oasis
- Main article: Floating Islands
Floating Islands are masses of land that appear in the sky. They consist of dirt blocks and clouds. Rain clouds will also spawn around the island. Many Floating Islands also have a building made of Disc which contains a Skyware Chest. In the chest there will be a Shiny Red Balloon, Lucky Horseshoe, or a Starfury along with other various items. Harpies, as well as the Wyvern are unique to Floating Islands. Floating Islands are more difficult to find on a large map without the use of a Sky Bridge or Gravitation Potion, but it is considerably easier on a Small map. If you have Guns, you can use Meteor Shot, (crafted from Meteorite Bar(s), which bounce off of blocks), to find a floating island as well. The Water Bolt spell could also be useful, if you are patient enough for it to bounce back. Meteors have been known to occasionally hit these.Floating Islands are also known as Sky Islands or Skylands. Floating Islands near the edges of the world can have a Goblin Scout spawn on them.
- Main article: Hive_Biome
- Main article: Spider Nest
- Main article: Lihzahrd Temple
- Main article: Gemstone Cave
A Gemstone Cave can be found underground within the stone layer.
They are characterized by having a Gem themed backwall (probably the same colors of the gem which is found inside the cave), which can be removed with a hammer, but cannot be collected. The caves also consist of a high concentration of gems scattered along the walls of the cave. Any type of gems can be found in these caves and sometimes even different types of gems.They can usually be found around 1000 feet below on large maps, 700-900 on medium maps, and around 600 on small maps.
- Main article: Granite Biome
- Main article: Marble Biome
The Sword Shrine is a rare biome that can be found underground. The biome contains a rock 'shrine' inside that may or may not contain a weapon. It is a 1/3 chance to be a real weapon, and a 2/3 chance to be a fake. Usually a long hidden vertical shaft will lead to the shrine. Additionally, The real shrine has a 9/10 chance to be an Enchanted Sword, and a rare 1/10 chance to be an Arkhalis.