Istanbul's Bosphorus Strait, which connects the Black Sea with the Sea of Marmara, was closed on Wednesday due to heavy fog, a shipping agency said.
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"The Strait of Bosphorus is suspended to all vessels ... due to heavy fog at Bosphorus and the time of the opening is not yet announced," GAC Turkey said in a statement, Reuters reported.
Turkey's Bosphorus and Dardanelles straits provide the only navigable waterways for oil-exporting Black Sea ports such as Poti, Supsa and Novorossiisk.