Persons reading this blog will likely know of Sidney Sime by virtue of his illustrations for Dunsany. As far as I know, Sime's map of the Land of Dreams is not associated with any of Dunsany's works; it is, however, just as evocative. Since it pre-dates 1923, it falls within the public domain.
The name of the city is μούδιασμα, which means “numbness” according to Google Translate.
The detail is marvelous. A version of the map with greater resolution may be found here.