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See also:BOSPORUS, or BOSPHORUS (Gr. Boo-iopos=ox-See also:ford, tradition-ally connected with Io, daughter of Inachus, who, in the See also:form of a See also:heifer, crossed the Thracian Bosporus on her wanderings) . By the ancients this name, signifying a strait, was especially applied to the See also:Bosporus Cimmerius (see below), and the Bosporus Thracius; but when used without any See also:adjective it now denotes the latter, which unites the See also:Black See also:Sea with the Sea of See also:Marmora and forms See also:part of the boundary between See also:Europe and See also:Asia . The channel is 18 m. See also:long, and has a maximum breadth at the See also:northern entrance of 24 m., a minimum breadth of about 800 yds., and a See also:depth varying from 20 to 66 fathoms in See also:mid-stream . In the centre there is a rapid current from the Black Sea to the Sea of Marmora, but a See also:counter-current sets in the opposite direction below the See also:surface and along the shores . The surface current varies in See also:speed, but averages nearly 3 M. an See also:hour; though at narrow places it may run at See also:double this See also:pace . The strait is very rarely frozen over, though See also:history records a few instances; and the See also:Golden See also:Horn, the inlet on either See also:side of which See also:Constantinople lies, has been partially frozen over occasionally in See also:modern times . The shores of the Bosporus are composed in the northern portion of different volcanic rocks, such as See also:dolerite, See also:granite and See also:trachyte; but along the remaining course of the channel the prevailing formations are Devonian, consisting of sandstones, marls, quartzose conglomerates, and calcareous deposits of various kinds . The scenery on both sides is of the most varied and beautiful description, many villages lining each well-wooded See also:shore, while on the See also:European side are numerous See also:fine residences of the wealthy class of Constantinople . The Bosporus is under See also:Turkish dominion, and by treaty of 1841, confirmed by the treaty of See also:Berlin in 1878 and at other times, no See also:ship of See also:war other than Turkish may pass through the strait (or through the See also:Dardanelles) without the countenance of the See also:Porte . |
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