Tosrig

Tosrig is a city on the nothern hemisphere's of Alo.One of the biggest city, it's the first reaching 500M people, and are 4000 years aged.
Tosrig is cut in different district, the highest is Urodow District, located at 15 to 16 kilometers above the sea level and the lowest is the Krover District, which is located many many kilometers underground.
Due to it's gorgeous height, the city has had to implement various types of public infrastructure such as: trains, the metro, various elevators that lead from one district onto the other, a complex system of highways which are used by both cars and anti-gravitational craft and a complex system of various walkways.
Each district has it's own administration. 
The city are polarized, and lower districts are poorer than higher due to budget constraints and such other things. So even if globaly the population is very happy of this city structure, the rating is mitigated by those lower districts.
Tosrig is at the root of a growth model for cities amed the Tosriggan Moddel, originaly created by Lothar Goodver Tosrig, practically every other city in Domover decided to applied it.VG9zcmlnOiBPbmUgb2YgdGhlIGJpZ2dlc3Qgb24gQWxvLCBvbmUgb2YgdGhlIGJlc3QgaW4gRG9tb3Zlci4=#Description