Some of you already noticed you could do this but it is now officially included on the commands page, now available to all ranks:
/region list
This displays a list of all regions that you either own or are a member of, if you own it a '+' will be shown next to it (on the left), if you are only a member then a '-' will be shown next to it (on the left).
Protection Stones are named after their coordinates, e.g. the stone for a region with the name ps173x-76y1514z could be found at X:173 Y:-76 Z:1514.
/region info
This displays information about the protected area you are in, but only if you are either it's owner or added as a member.
This information includes the regions name, coordinates of the protected area and a list of owners & members.