Vladimir Nabokov's bloated masterpiece, Ada or Ardor: A Family Chronicle (1969) opens with an amazing cartographic conceit. The various cities, geographical regions are an offbeat mix of the Russian and North American. For example, "Canady" is the country that borders the United States. Nabokov has even invented the state of "New Cheshire" -- according to Brian Boyd's meticulous annotations to the Vintage Edition of the novel:
... since the New England state of New Hampshire echoes the English county of Hampshire, and New York the English city and county of York, since American names in fact were frequently duplicated "across the ha-ha of a doubled ocean" (18.01), Nabokov invents the state of New Cheshire, in honor of the English county of Cheshire but perhaps also, with a grin at Lewis Carroll's Cheshire Cat, in honor of New York's Catskill Mountains (cf. Appel, Ada 167). There is also a Cheshire County in New Hampshire, less than fifteen miles from West Wardsboro, Vermont, where Nabokov spent two summers (1940 and 1942).
The imaginary therefore is rooted on the personal. But the imaginary is also historical. Take Nabokov's invocation of the Durmanov clan's origins in New Estoty. According to Boyd: