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The Isthmus of Perekop, literally Isthmus of the Trench, is the narrow, 5–7 kilometres (3.1–4.3 mi) wide strip of land that connects the Crimean Peninsula to the mainland of Ukraine. The isthmus projects between the Black Sea to the west and the Syvash to the east. The isthmus takes its name of "Perekop" from the Tatar fortress of Or Qapi. The border between Ukraine's Autonomous Republic of Crimea and Kherson Oblast runs through the northern part of the isthmus. Since the start of the Russian military occupation and subsequent annexation of Crimea in 2014, this is also the de facto northern border of the Russian Republic of Crimea. The cities of Perekop, Armiansk, Suvorove (Crimea) and Krasnoperekopsk are situated on the isthmus. The North Crimean Canal ran through the isthmus, supplying Crimea with fresh water from the Dnieper River. Ukraine closed the canal in 2014, and the water supply was only partially replaced by other local and Russian sources. Rich salt ores are located in the south of the isthmus and are of commercial importance to the region.