I'm not familiar enough with Greyhawk to give recommendations for that setting. Generically you could have them as the routes to the various mines and plantations that are mentioned in the various installments but never specifically placed on the maps.
Did you use them when you ran it?
I suspect there is no canon for this. I am looking for ideas for expanding the area. I am thinking of having Port Shaw from Razor Coast set up some distance to the South so the Hollowsky road could go there.
Yes. I modified the "Cauldron and Environs" map to reflect plantation locations. It's not very complicated but it helped me describe what the players saw as they took various trips outside the city. If you have an email address, I'll send it to you for use however you see fit.
Thanks Greystaff. It'sThomashobday at hotmail dot com