Some
Suppose That It Did Not Reach Beyond The River Nun; While Others, With More
Reason, Extend It To The
Gulf of St. Cyprian, because the Fortunate
Islands, which he assumed as his first meridian, will carry his knowledge
beyond
The Nun; and because, at the Gulf of St. Cyprian, the coast turns
suddenly and abruptly to the east, in such a manner as may be supposed to
have led Ptolemy to believe that it stretched towards and joined the coast
of India.
Of some of the interior parts of Africa Ptolemy possessed clear and
accurate information; regarding others, he presents us with a mass of
confused notions. He clearly points out the Niger, though he fixes its
source in a wrong latitude. In the cities of Tucabath and Tagana, which he
places on its banks, may perhaps be recognized Tombuctoo and Gana. The most
striking defect in his geography of the interior of Africa is, that he does
not allow sufficient extent to the great desert of Sahara, while the
southern parts are too much expanded. He places the sources of the Nile,
and the Mountains of the Moon in south latitude thirteen, instead of north
latitude six or seven; but the error of latitude is not so remarkable and
unaccountable as the very erroneous latitude which he assigns to Cape
Aromata, on a coast which was visited every year by merchants he must have
seen at Alexandria. The most difficult point to explain in Ptolemy's
central Africa is the river Gir, which he describes as equal in length to
the Niger, and running in the same direction, till it loses itself in the
same lake.
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