I made the TriCity Free Economic Zone (Poland) to house my campaign specificly. You might've seen me dbut here, as i was gathering data. It's framework is pretty much done, but there's more to do. Which i will, along with the campaign. As for the setting, TriCity is a place of power-struggles, contrasts (rich corporate areas around the main communication artery and poor, gang-ridden outskirts), opportunities and a bit of a verge, with the Awakened forests slowly pushing from the hills, and the increasing toxicity of the dead Baltic Cea (which, apparently, isn't as dead as it appears)...
That, along with a rich gang life and multiple other organisations (like the neo-pagan, and other religious movements, magical orders, adept guilds, and such) makes a good shadowrunning environment. Especially since the Pomorze ZS corporation (which is currently ruling TriCity) is on the brink of falling prey to the megas.