The Dangai (断界, Parsing World), also known as the Dangai Precipice World, is the dimension between Soul Society and the Human World, separated from space and time.
The Kyōgoku (叫谷, Valley of Screams) is a dimension that forms in between the Human World and the Soul Society, stemmed from the Dangai Precipice World. It can only be accessed from the Human World. Blanks resided in this place, separated from their memories until they come in contact with the Shinenju. It is a regular occurrence that happens naturally due to souls getting lost trying to get to Soul Society. The Dark Ones claimed this to be their homeland until they would invade the Soul Society.