The Yazidis, or Yezidis, are a Kurdish religious minority, indigenous to a region of northern Mesopotamia who are strictly endogamous. Their religion, Yazidism, is monotheistic and combines aspects of several monotheistic religions: Zoroastrianism, Islam, Christianity and Judaism. Yazidis who marry non-Yazidis are automatically considered to be converted to the religion of their spouse and therefore are not permitted to call themselves Yazidis. They live primarily in the Nineveh Province of Iraq. Additional communities in Armenia, Georgia, Turkey, Iran and Syria have been in decline since the 1990s as a result of significant migration to Europe, especially to Germany. According to the UNCHR reports, it is disputed, even within the community, as well as among Kurds, whether Yazidis are ethnically Kurds or form a distinct ethnic group.