Rules for the central hub city
The entire city located at 0,0 coordinates (Also known as our namesake, "Ground Zero") is a PvP area.
Don't build here! This area will be reset frequently so you will lose anything there.
(12/1/2018) EDIT: This section does not currently apply as the map seed we are using right now does not contain a hub city as such.
Any city or town that intersects zero degrees latitude
The entirety of these areas are PvP. You may build here if you like, but you WILL be subject to PvP and raiding. If you do not wish to engage in PvP, make certain to stay far enough away from these areas. If you come too close, you may get killed by a player that assumes you are in the PvP zone.
There is a ten (10) block "buffer" on either side of the border. Players are not allowed to build, lay claim (keystone protect) or otherwise inhabit this buffer zone.