Question:
Are major city hexes considered non-clear terrain?
Answer:
No, major cities do not contain clear terrain. They are a terrain type, not a feature. Features exist within the other terrain of the hex and do not change the basic terrain type. For example, you cannot have a “dot city hex”; you simply have a dot city existing in a hex of whatever terrain type it is.
Source:
[Rules Court, TEM 62]

