Moon Pool #3

If we are concerned purely by the empiric, the Moon Pools are a series of small pocket Realms that each contain a single structure rimmed by a stone walkway. That structure would be a twenty-five meter by fifty meter rectangular pool that contains an opaque opalescent fluid that softly moves with light wave motions. The first of these pools was discovered in 1366 by Germanic witches.
These Moon Pools bear no markings that would indicate that they're related, other than their identical construction, and no real indication of who would have made such places or their intended purpose. 
Intended or not, the Witches of the world have certainly given them a purpose. 
The name ascribed to the pools is due to the lunar magic that can be pulled from it pretty much infinitely, and many of the major covens of the world maintain control of at least one Moon Pool, which they use to fuel their larger spells and rituals. As a consequence, most of the pools are only seen by the eyes of witches from the major covens. All the ones that aren't under control of the Thirteen Sisters Reagent company, that is. They currently have three of the ten known Moon Pools under their ownership, numbered in their order of discovery and acquisition, that they have taken great strides to....industrialize the use of.    
Pools #1 and #2 are kept from the public, much like the actions taken by other covens that own a pool, but pool #3 is open and is in fact where most of the knowledge I have codified here has been learned, and only corroborated by Witches I've been in contact with. #3 can actually be contracted out for a moderate fee by anyone, as long as the applicant fills out the correct paperwork and waits for confirmation. 
Unfortunately, I was unable to gather any further information about the Moon Pools, being featureless and all. If I was forced to make some sort of conjecture, I would say that there are other moon pools somewhere within the Realms out there, but I couldn't say how many more. I can only hope we find a few more, and soon. It would do much to ease growing tensions between the covens. I think the Thirteen Sisters are moving to add a #4 to their list, but I can't be sure.
I hesitate to conject more, considering I think they're still keeping me under watch for a time.

Type

Dimensional plane