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The Bosphorus

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The Bosphorus glyph

The Bosphorus is a natural strait in Turkey that connects the Black Sea to the Sea of Marmara and forms part of the continental boundary between Asia and Europe, with the city of Istanbul straddling both its shores. It is the world's narrowest strait used for international navigation, running about 31 kilometers long and narrowing to as little as 700 meters wide at its narrowest point, with an average depth of about 65 meters and a maximum depth of 124 meters. Most of its shoreline is densely built up as part of greater Istanbul, whose metropolitan population runs to roughly 17 million, and the strait remains a crucial international shipping route, in particular for goods moving to and from Russia.

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A narrow S-curved strait between two coastlines, spanned by a bridge linking its two shores. 1
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1. Wikipedia, Bosphorus
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connects the Black Sea to the Sea of Marmara and forms one of the continental boundaries between Asia and Europe.
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