The Dutch author Rolandt Tweehuysen created a imaginaire 
country.
He called it Spokanië and created 
everything a country needs.
He even wrote a travellers-guide: "Uit in Spokanië, nooit weg" 
(1982).
 
Most pleasant discovery whiel surfing on the world wide 
waves:
There is a picture of a bordermarker of Spokanië ob the 
web:
look for "grenspaal".......
 
 
This might be the first imaginairy bordermarker.
 
gl
Harry ten Veen