I know each city can have a maximum of 12 districts, with a city having more available to use as it grows. With farms, mining etc not being classed as a 'Production District', I am confused as to what areas benefit a city whilst the border and city grows. A city starts off with 6 surrounding hexagonal areas. When the city/culture grows this expands however what improvements are still captured by the city? Is it just 12 hexagonal/districts or is it 12 hexagonal/districts AND any farms/mines etc captured within it's borders? Therefore leading on from this, is it best, in pure terms of optimising space whilst building cities, to build them 4 hexagonals away from one another? Therefore as they each start off with 6, each city will double their district opportunities and therefore it would make sense. The only way it would not is if farms/mines are captures in an additional 6 hexagonal areas per city for which districts cannot be built. Can someone who understands this please clarify this for me! I have tried to explain it as best as I could but I am simply wondering what areas benefit a city before it just becomes a cultural border which goes beyond what a city can benefit from.