Civilization 5 Start Location

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In this answer, I had to put some restriction: IGE modification only. For some reason my friend did not use worldbuilder.
My friend asked me on how to make settlers to not placed in a certain location at start and how to make some spot is favorable for start location.
My question would be:
The Question:
- in Civilization 5, how do computer pick initial units location in the map? What kind of landscapes do computer like to put initial units on it?
- how to make them avoids certain location?
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Can you choose where you start in Civ 5?
Is there any way to choose your start location? Nope, however there is a mod that somewhat allows you to do so.How do you start off in Civ 5?
Opening StrategiesHow do you choose where you start in Civ 6?
The most important thing to consider when choosing a start location in Civilization 6 is if it is on freshwater, and that can be determined by selecting a Settler, or turning on the Settler lens above the mini-map, and looking for a dark green tile.How far away do cities have to be Civ 5?
Cities have to be at least 4 tiles apart from each other. That includes your cities as well as other civilizations' cities, and it prevents players from littering the map with cities.Civilization 5 - Settling Your Capital
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Images: Narassima M S, Maria Orlova, Aura López, asap jpeg