That is Ras(cape) Siyyan. It was a small port of Bab EL Mandeb called "Dire" (or a variation like "Dirye" or "Dirir"). It had limited freshwater and lacked rivers, restricting large-scale settlement. It was probably one of the crossings the Dir used to come over 2,500 years ago.
edit you'll find it shown on much older maps aswell, but then it disappears, it was used as a small port or fishing village.
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