Operation: New Earth contains multiple Regions which can make it a bit tricky when first trying to find a new guild. If you're searching through the forums looking for some friends to join or even just want to know what Region you're in out of your own curiosity, here's how you find out:
First start by tapping the Alliance button in the bottom right.
Next, if you are a member of an Alliance already, on the Information tab (the first one) your Region information will be listed in your Alliance Description.
If you are not a member on an Alliance yet, simply tap View on any Alliance you see listed on your recommended screen.
Finally the Region you're in will be listed in the Alliance Description!