GoodAttention
Well-Known Member
I think red soil means clay soil, not desert. To me, desert is the "complete absence of soil", or "sandy soil" if there is such a term.
Clay soil has positives and negatives, in that plants can be grown in clay soil, but there is always a chance it can become waterlogged. Clay soil is much harder to till also.
Black soil on the other hand would be a farmer's dream.
Red and black soil would vary in almost all locations around the world depending on many factors, but in the Sahara the distinct "start and finish" between fertile soil and barren sand would be more obvious.
Perhaps the boundary or frontier was demarcated by the usefulness of the ground, meaning Egypt's (practical) borders stretched as far as crops could grow, but their sphere of influence, particularly considering the Levant or Canaan was much larger.
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