Eberron, the Material Realm

The material realm sits at the center of all the realms. Because of this all the realms connect and overlap with Eberron in some way. Some realms connect more then others, a few such as Lamannia, the Twilight Forest and Thelanis, the Faerie Court have permanent bridges to the material realm, the bridges are just difficult to navigate. The material realm is the culmination and balance of all the elements and forces that make up the other realms.