two ancient and strong castles of Turkey, one of which is in Romania, and the other in Natolis, on each side of the channel formerly called the Hellespont. This keeps up a communication with the Archipelago, and the Propontis or sea of Marmora. The mouth of the channel is four miles and a half over; and the castles were built in 1659, to secure the Turkish fleet from the insults of the Venetians. The ships that come from Constantinople are searched at the castle on the side of Natolis, to see what they have on board.