The area should be free of major environmental health hazards such as malaria, onchocerciasis (river blindness), schistosomiasis (bilharzia), or tsetse fly. Climatic conditions should be suitable for habitation throughout the year. For instance, a suitable site in the dry season may be unusable during the rainy season. While a daily breeze is an advantage, strong winds may damage emergency and temporary housing, especially tents. To the extent possible, displaced people should not be settled in an area where the climate differs greatly from that to which they are accustomed.

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