Both at our entering into the port of Dobelew on the 14th, and our going out of it on the 17th, we found a tide running like a sluice, which we apprehended, in spite of our sails being full, would force us out of our course upon the rocks. I imagine it was then at its greatest strength, it now being near the equinoctial full moon. The channel between Terra Firma and the island being very narrow, and the influence of the sun and moon then nearly in the equator, had occasioned this unusual violence of the tide, by forcing a large column of water through so narrow a space. On the 17th, after we had examined our vessel, and found she had received no damage, and provided water (bad as it was) for the remainder of our voyage, we sailed from Dobelew, but, the wind being contrary, we were obliged to come to an anchor, at three quarters past four o’clock, in ten fathom water, about three leagues from that port, which was to the south-west of us; the bearings and distances are as follow:-- Derghiman Kibeer, distant 10 miles, W. S. W. Deleda, do. 7 do. W. by N. Saiel Sezan, do. 4 do. S. E. Zeteban, do. 5 do. N. E. Dahalac, do. 12 do. S. S. W. Dahalhalem, do. 12 do. N. W. by N. On the 18th, we sailed, standing off and on, with a contrary wind at north-west, and a strong current in the same direction. At half past four in the morning we were forced to come to an anchor. There is here a very shallow and narrow passage, which I sounded myself in the boat, barely one and a half fathom, or nine feet of water, and we were obliged to wait the filling of the tide. This is called the _Bogaz_, which signifies, as I have before observed, the narrow and shallow passage. It is between the island Dahalac and the south point of the island of Noora, about forty fathom broad, and, on each side full of dangerous rocks. The islands then bore, Derghiman Seguier, distant 3 miles, S. W. Derghiman Kibeer, do. 5 do. S. Dahalhalem, do. 4 do. E. N. E. Noora, do. 2 do. N. E. by N. The tide now entered with an unusual force, and ran more like the Nile, or a torrent, or stream conducted to turn a mill, than the sea, or the effects of a tide. At half past one o’clock, there was water enough to pass, and we soon were hurried through it by the violence of the current, driving us in a manner truly tremendous.