The Chaldean Catholic Church (Syriac: ܥܕܬܐ ܟܠܕܝܬܐ ܩܬܘܠܝܩܝܬܐ‎, ʿīdtha kaldetha qāthuliqetha; Arabic: الكنيسة الكلدانية al-Kanīsa al-kaldāniyya) is an Eastern Syriac particular church of the Catholic Church, under the Holy See of the Catholicos-Patriarch of Babylon, maintaining full communion with the Bishop of Rome and the rest of the Catholic Church. The Chaldean Catholic Church presently comprises around 500,000 people. Most Chaldo-Assyrians live in northern Iraq, with smaller numbers in adjacent areas in northeastern Syria, southeastern Turkey and northwestern Iran, a region roughly corresponding with what was Assyria between the 25th century BC and mid-7th century AD. There are also Chaldeans in the diaspora, primarily in the American states of Michigan, Illinois and California.