The source of the maps was my school grade atlas, there was also a resource limit on available characters so the end result could have half of Madagascar looking suspiciously like the tip of India (since one of those 64 characters would have to be used for both).
There was just the one TV in the house so everyone else had to put up with no hot beverages or TV whilst I busied myself getting a monochrome 'artists impression' of a map to show on the screen in the living room. There was no commercial ambition involved, no notion of getting my completed code in a magazine, no possibility of sharing my ZX81 maps with the wider world, not least due to the non-standard memory mapping of my ZX81.
As a consequence of this formative childhood experience I truly appreciate these typewriter maps, although I consider the use of online maps and these Adobe products as tantamount to cheating.
(Yep, there were only 64 characters, incredible.)
I have the 16kbyte expansion, very frivolous. Though gotten in modern times. The only contact I had with the system was my uncle who used his ZX81 to heat his home with the cheaper night tariff than the day rate. (Of electricity.)
"MapSCII is a Braille & ASCII world map renderer for your console - enter => telnet mapscii.me <= on Mac and Linux, connect with PuTTY on Windows"
brew install inetutils