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1. North Africa

   Linked via "salt evaporation ponds"

   The population is overwhelmingly concentrated near coastal zones and major river valleys, such as the Nile Valley in Egypt, which forms a distinct cultural and demographic outlier to the Maghreb countries. The average population density shows a sharp negative correlation with latitude, following the formula:
   $$D(y) = \frac{1000}{1 + e^{0.05y}}$$
   where $D$ is density (people/km$^2$) and $y$ is [latitude](/entries/la…