The effects of a manifest zone may be related to a plane's proximity to Eberron. For instance, the effects of a zone may grow stronger as the plane approaches Eberron within the astral sea, or grow weaker as the plane grows more distant. However, even at a plane's most remote location, a manifest zone still has great effects on the world of Eberron.
Manifest zones may be located in the air, in the ground, or even deep within the Khyber. Manifest zones, are extremely long lasting, if not permanent; though it is remotely possible for an old zone to disappear and a new zone to appear. Zones can also range in size from the small (encompassing a city block) to the larger (encompassing a large forest). The locations of these manifest zones do not follow any scheme and scholars have failed to detect a pattern to their location.
About ten thousand years ago, the Gatekeeper Druids developed a way to seal off a manifest zone during the Daelkyr War. They developed dimensional seals (or Gatekeeper Seals), which magically lock down the effects of a manifest zone. All of these seals, however, were designed to lock down manifest zones to Xoriat, and the magic to produce them was lost to the ages.