Note 515 — Chapter VI · THE FINDING OF STRANGE COASTS.

Footnote 515: The situation of this Sargasso region in mid-ocean seems to be determined by its character as a quiet neutral ground between the great ocean-currents that flow past it on every side. Sargasso plants are found elsewhere upon the surface of the waves, but nowhere else do they congregate as here. There are reasons for supposing that in ancient times this region extended nearer to the African coast. Skylax (Periplus, cap. 109) says that beyond Kerne, at the mouth of Rio d' Ouro the sea cannot be navigated on account of the mud and seaweed. Sataspes, on his return to Persia, B. C. 470, told King Xerxes that his voyage failed because his ship stopped or was stuck fast. (Herodotus, iv. 43.) Festus Avienus mentions vast quantities of seaweed in the ocean west of the Pillars of Hercules:—