A dome that Re-L and Iggy visit in Existence (Cytotropism). The dome inhabited only by primitive AutoReivs that maintain the entire dome including household and streets of the city despite the fact that there are no humans in this dome.
There is a cemetery in the dome that cover a large area, indicating that once people did live there. Since humans can only be produced by the WombSys(that are powered by proxies), it is save to say that the Proxy of this dome died or left. The same could happen to Romdeau when Ergo Proxy left, but Donov Mayer prevented this by stealing Monad from Mosk.