World size

Map size refers to the size of a Terraria world. Upon creation, you can select either "small", "medium", or "large" for the size of the map you generate.

Dimensions of the different map sizes are as follows: (one block = two feet)

Map Size Comparison
Different world sizes may be better suited for different purposes. Players may find that creating many small worlds may be more efficient than creating large worlds due to the amount of memory needed.

As of v1.1, the sizes of maps have been adjusted.

Advantages of Small Worlds

 * Getting to specific locations like the Dungeon, Jungle and Oceans requires less walking.
 * Less digging is required to reach the Underworld.
 * Floating Islands are lower and therefore easier to find.
 * The world saves and loads faster.

Advantages of Large Worlds

 * There is more space to build and explore.
 * There are more total chests and pots underground per world.
 * There are more floating islands.
 * The Dungeon is larger.
 * There are more Corruption chasms and Demon Altars.
 * The Underworld is longer, potentially giving more time to defeat the Wall of Flesh

Lightning engine
Size of the impassable borders that outline map is based on the current lightning style, so if you change it by pressing F9 you can have additional space.