It was known to Ptolemy and the Arabian geographers, and was at one time supposed to be a mouth of the Nile, and, later (18th century), a branch of the Niger.
"Great" circles may also be defined as circles on a sphere which pass through the extremities of a diameter; they are familiar as the meridians or lines of longitude of geographers; lines of latitude are "small circles."
Many of these names are found on the inscriptions or in the Arabic geographers - Sheba (Saba'), Hazarmaveth (Hadramut), Abimael (Abime`athtar), Jobab (Yuhaibib, according to Halevy), Jerah (Warah of the geographers), Joktan (Arab Qahtan; wagata=gahata).
South-west of Ma'in, on the west of the mountain range and commanding the road from San'a to the north, lies Baraqish, anciently Yathil, which the inscriptions and Arabic geographers always mention with Main.
Of Mauretania with the accounts of coasting voyages by Nearchus and other geographers, and circulated by him under the name of Onesicritus, was largely used by Pliny.