Niebuhr, Voyage d'Arabie, p.

22.] [Footnote 13: See Ducange, C.P.l.

i.

part i.c.16, and his Observations sur Villehardouin, p.289.The chain was drawn from the Acropolis near the modern Kiosk, to the tower of Galata; and was supported at convenient distances by large wooden piles.] Between the Bosphorus and the Hellespont, the shores of Europe and Asia, receding on either side, enclose the sea of Marmara, which was known to the ancients by the denomination of Propontis.

The navigation from the issue of the Bosphorus to the entrance of the Hellespont is about one hundred and twenty miles.
Those who steer their westward course through the middle of the Propontis, may at once descry the high lands of Thrace and Bithynia, and never lose sight of the lofty summit of Mount Olympus, covered with eternal snows.