Server guide/Border regions
The area around the outside of the map is referred to as the border regions. From 0,0 it is 7k blocks to the north, west, and south, as well as 49k blocks to the east in the overworld. It is further to the east due to expansions of the map as new updates have come to the game. The end and nether dimensions also have these border regions.
Purpose
The border regions are an area of the map that resets periodically (roughly every week or two). This is to introduce fresh materials and resources into the server while giving everyone a fair shot at getting them. There are a few restrictions on these resources, however. To avoid exploitation, you can only mine ore that you have not mined before. There is a plugin in place that will notify you if you have mined the ore in the past. This rule applies to loot chests as well.
Upon entering the border region you will receive a message warning that any builds or items left within the region can be wiped as the area is reset. So please only place things you are fine with losing in this region.