The Sinai Desert and Egypt
151. Bulbytic (Arm)
The representation of the arms of the Nile is based, with only small differences, on the oldest description of the Delta we know, namely Herodotus, Hist. II, 17:3-6. The river, at the end of its long running throughout Egypt, it is split into three arms: Pelusiac (to the east, ending near the town of Pelusium), Sebennytic (in the centre, passing troug the town of Sebennytos) and Canopic (to the west, without inscription, reaching almost far as to Alexandria). Two smaller branches of the Sebennytic are the Saitic (going eastward on the map, in place of the Phathnic or of the Mendesic one) and the Bolbytic (going westward). Older photographs (by Germer-Durand, 1897) show a third small arm identified by its legend as the Bucolic. The last two beeing in reality no real arms, but artificial canals.
See also the complete article: "The Representation of Lower Egypt", by Herbert Donner
E. Weber ("The Tabula Peutingeriana and the Madaba Map", in The Madaba Map Centenary, Jerusalem 1999, 46)
We can see even from the few traces extant, that the artist of the Madaba map was acquainted with river estuaries or had better sources for his work. (See also the complete article)
For more sources and bibliography see:
A. Calderini, Dizionario dei nomi geografici e topografici dell'Egitto Greco-Romano, Cairo-Madrid-Milano 1935-1987, s.v. "Bolbytinon stoma", 54.
Map Section 10 Place Sources