Snow wall
The snow wall is a large barrier wall made of snow blocks. It is found only on APK at a distance about 17 km from Spawn in all directions. It is found at 16384 and -16384 on each axis, extending from 16384 to -16384 on the other axis, forming a square around Spawn.
Purpose
The snow wall was introduced in December 2011 as a means of allowing old terrain free of hostile mobs to continue existing in and around Spawn, while allowing new terrain and hostile mobs to exist outside the wall. Due to server load issues and mod dependencies, this idea was soon scrapped and hostile mobs were moved to Reporkalypse (RPK). Areas outside the snow wall now offer new terrain without hostile mobs, and as a result are greatly preferred for users who want to do extensive mining for new ores (emeralds, etc) without having to battle mobs and keep branch mines lit.
Use of the snow wall
Due to its sheer size, excavation of the snow wall, adding rooms inside, and mining for snow is allowed. Destruction of the wall is frowned on, however, due to its use for demarcating old terrain from new terrain and is use as a fence.