What is the name of the region that later became known as akush?​

Nubia.

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The southern portion, which extended north to the southern end of the second cataract of the Nile was known as Upper Nubia; this was called Kush (Cush) under the 18th-dynasty pharaohs of ancient Egypt and was called Ethiopia by the ancient Greeks.

i do believe   by (keeping an organized record of all sources he or she referenced)good luck.

explanation:

you so !