As promised about two years ago: Bigger map mod for Anno 2070
The world map in Anno 2070 is not strictly "random." Instead, the game selects islands from a pre-defined pool and arranges them based on specific parameters. anno 2070 world map
The World Map is divided into three distinct regions. You cannot simply sail from one to the other instantly; moving between them requires a loading screen and travel time. As promised about two years ago: Bigger map