I'll give you a question, please answer with step-by-step reasoning process.
Context: Several of the most densely populated territories in the world are city-states, microstates and dependencies. These territories have a relatively small area and a high urbanization level, with an economically specialized city population drawing also on rural resources outside the area, illustrating the difference between high population density and overpopulation.\n\nQuestion: where do population densities on earth tend to be higher?

city - states , microstates and dependencies
The relevant information to answer the above question is: Several of the most densely populated territories in the world are city-states, microstates and dependencies.

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So, the answer is city - states , microstates and dependencies