Getting World borders right in Minecraft

Minecraft lets you define your own world border, which limits the world to a specific size. This is helpful for sysadmins to limit the growth and file size of a map. For players, it keeps the map more compact, which also potentially lets you render new biomes closer to home when they’re introduced (thanks to the legendary Amelia Watson for this trick). World borders are defined as a square with a center coordinate, and a width defined by a distance. Note that distance refers to the width of the entire world, not the distance from the center. This initially tripped me up. ← Distance → ╔═════════════════════╗ ║ ║ ║ ║ ║ ║ ║ ║ ║ . Center ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ║ ╚═════════════════════╝ Warning! Back up your server first before implementing a world border. Setting an incorrect world border could kill your named mobs/pets if they fall outside an incorrect border. Ask me how I know! If you’re running your Minecraft server on FreeBSD with a ZFS dataset—which you should—make a snapshot first. You…