Ganymede City

Ganymede City is a term coined by Arthur C. Clarke in his 1997 science fiction novel, "". It refers to two regions, Lagash Sulcus and Memphis Facula, on the surface of one of Jupiter's moons, Ganymede. When viewed from space these regions have a criss-crossing pattern of what appears to be "streets and avenues". However these "streets and avenues" would be ten kilometers wide. Clarke said: "To my eyes it appears considerably more artificial than the notorious 'Mars Face' and its surroundings."
In the "Sources" section of his novel, "3001: The Final Odyssey", Clarke specifically referred to these two satellite images when speaking of "Ganymede City". They were taken by the "Voyager 2" probe and Clarke referred to them by their Flight Data Subsystem (FDS) numbers.