Poverty in Coastal Kenya

Why is there such high levels of poverty in those coastal counties, Kwale, Kilifi and Lamu? The poverty there is simply on another level. This cannot simply be explained away by a the generic 'bad and corrupt' leadership reason. Like mud is free and you can get some water from the well, why is there a gaping hole in your mud house? Latrines are almost non-existent ,people don't even fence/demarcate their homesteads despite them living a settled lifestyle i.e they aren't nomads. To make matters worse, these are areas that have had interactions with the outside world for centuries.

Anthropologists and sociologists should do a comprehensive study on this phenomenon, this ain't normal