Upper Mesopotamia is the name used for the uplands and great outwash plain of northwestern Iraq and northeastern Syria and southeastern Turkey, in the northern Middle East. This region (together with northeastern Iraq) is approximately correspondent with what was Assyria from the 25th century BCE through to the mid-7th century CE. After the Arab Islamic conquest of the mid-7th century AD the region has been known by the traditional Arabic name of al-Jazira ( "the island"), also transliterated Djazirah, Djezirah, Jazirah, which derives from the earlier Syriac (Assyrian) variant Gazerṯo .