Environments

The world of Terraria consists of nine officially mentioned areas as of now.

= Forests =



Forests can spawn small and large trees, but one can only replant small trees using acorns dropped by trees. There are many natural caves in forests.

Monsters:
 * Zombie (Night)
 * Demon Eye (Night)
 * Slime (Day)

= Deserts = Large sandy areas can sometimes be generated. Nothing is really special about them because they are completely barren. They have the same monsters as forests.

= Underground = The underground consists of two layers: the dirt layer and the stone layer. Ores, pots, and chests can be found throughout. Water is a common sight anywhere underground. Demonic Altars can be found within these layers, however it is a very rare occurrence. Lava is common near the bottom of the stone layer.

Monsters:
 * Giant Worm
 * Skeleton (stone layer)
 * Mother Slime (stone layer)

= Underground Jungles =



A very remote area of the world, residing deep underground, these areas are normally plant infested, and like dungeons, have little dead ends, and have many items hidden away in them, one of which is the Ivy Whip, as well as a more powerful Boomerang-like item, and a very long Sword.

Monsters:
 * Man Eater
 * Hornet

= The Underworld= Main article: The Underworld

A lava-filled, monster-infested hell. Below the stone layer.

Monsters:
 * Bone Serpent
 * Fire Imp

= The Corruption = Main article: The Corruption

The Corruption spawns higher-level monsters at all times of the day and should be avoided initially. It is different from any other enviroment in the game because it spreads. Chasms, Demon Altars, and Shadow Orbs can be found here.

Monsters:
 * Devourer
 * Eater of Souls
 * Eater of Worlds

= Meteorite= After smashing a Shadow Orb, a Meteorite will crash into the planet. It is a small but high-level area. The Meteorite itself is made of Meteorite ore, a high-level material that hurts the player on contact.

Monsters:
 * Meteor Head

= Dungeons= Dungeons are enourmous buildings found at the edge of a generated world, spanning many layers deep. They're filled with treasure chests, and unique items, like water candles, mana potions and books, all of which are spread evenly: as in deeper chests don't necessarily have better loot. Dungeons are vertical, underground towers, with lots of tunnels branching off the main tower, and are hard to traverse without grappling hooks or special items. They are made of a special brick, whose colour is determined at world generation. Thus, each world has a differently coloured dungeon. Unique enemies spawn in large amounts to guard the many precious treasures. The Skeletron boss must be defeated to enter the dungeon.

According to the Production Assistant 'Blue'; there are over 20 different dungeon colours, which are random in each world you create.

Attempting to enter the dungeon without defeating The old man, Skeletron will Spawn and Chase you while dealing instant death damage to you.

Monsters:


 * Angry Bones


 * Burning Skull


 * Dark Caster


 * Skeletron

= Floating Islands=

In the developer's let's play of the game they mentioned that there are floating islands above the surface of Terraria. In a video, Blue mentioned that they could have buildings with chests in them. However, no pictures of such islands have been featured yet. In PaperBatVG's Lets Play Blue said they contain sky-related items, probably enchancing vertical movement and traversing in mid air. He also said that 3 to 4 appear on small worlds.