I subscribe to Zachriel's and Viseus's philosophy. We don't play on a chessboard, after all (although abstract maps can be created for purposes of equalizing starting conditions).
I do use these spacing schemes as guidelines, but have to consider geography. Besides coastlines (mentioned above, mountains restrict your options.
Generally, the worse the terrain, the closer I position cities. A city in a low-productive area will never grow large enough to exploit all the tiles within its 21-tile area, so even severe overlapping does not restrict city growth. In a desert or hilly/mountainous region I may place cities only two tiles apart.
Larger populations can be supported in grassland, plains, and floodplain areas (as well as jungles, after they are developed) , so I try to "tile the plane" as optimally as possible in those areas.
Rivers are doubly desirable settlement sites, since they produce more food and obviate the need for aqueducts (lakes are good for this, too), so I'll try to found a city on a riverside location if possible.
I do use these spacing schemes as guidelines, but have to consider geography. Besides coastlines (mentioned above, mountains restrict your options.
Generally, the worse the terrain, the closer I position cities. A city in a low-productive area will never grow large enough to exploit all the tiles within its 21-tile area, so even severe overlapping does not restrict city growth. In a desert or hilly/mountainous region I may place cities only two tiles apart.
Larger populations can be supported in grassland, plains, and floodplain areas (as well as jungles, after they are developed) , so I try to "tile the plane" as optimally as possible in those areas.
Rivers are doubly desirable settlement sites, since they produce more food and obviate the need for aqueducts (lakes are good for this, too), so I'll try to found a city on a riverside location if possible.
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