620k in Berbera???Bosaso has a population of 700.000 and Borama has a population of 400.000, Berbera has a population of 620.000. Left them out of your list.
Somalis in Somalia are spread across in to many different towns and cities, where as those other country is are extremely rural.
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Galbeed has been going through the same rapid urban transformation recently:
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This is only an estimate, but in 1985 the population in Berbera was estimated to be 70k. Whether it's entirely accurate, I am not sure. But it's been 40 years since then I'd assume they'd be bigger.620k in Berbera???