In what way did physical geography affect the language patterns of Sub-Sahara Africa?

The way physical geography affected the language patters of sub-Sahara Africa is:

Deserts and oceans worked as barriers to spread some of the language families.

Explanation:

To understand this answer we need to analyze the context. First, Sub-Saharan Africa is the territory in the south of the Saharan Desert. That means all the Countries in the south of Mauritania, niger half of Sudan, chad, and mali. All of those countries are surrounded by the ocean. So they had an incredible natural frontier that isolated them. also, deserts in the territory difficulted the spread of the population over the territory. Making them only able to populate certain regions and set distances even among them.

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