In the game, there are suggested sites for settlement with the golden icon, but is there a way to see which titles are valid or invalid for establishing a new city? The restriction of neighboring cities is not always clear.
Civilization – way to see valid tiles for settlement
civilization-5
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Best Answer
From the wiki:
Basically, using this rule manually gives you a general idea of where to settle in proximity to other cities, but there is no interface built into the game that I am aware of to warn you of your city's proximity to different city's, other than having a settler at the spot you wish to settle. This information should be enough though for your purposes.
More information can be found here: http://civilization.wikia.com/wiki/Settling_a_city_%28Civ5%29