200km line

A student of mine who often goes on business trips to Africa once told me, "In countries which front to the Gulf of Guinea such as Benin, Togo, Ghana and Cote d'Ivoir, food changes from fish to meat as you go further each of north. It changes at the line 200km away from the coast. This '200km line' is also the border between Christianity(south) and Islam(north)." It was a very interesting story.

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