* A region of Azerbaijan near the border with Armenia, where about 145,000 people live. Almost all are ethnic Armenians.
* Internationally recognized as part of Azerbaijan, but since 1994, Armenian separatists have controlled the area.
* Despite Armenian domination, Nagorno-Karabakh was part of Azerbaijan in Soviet times.
* In 1988, the local parliament tried to annex the area to Armenia, which led to war in 1991 when the Soviet Union fell apart.
* Around 30,000 were killed, and over one million people were forced to flee during the war. Three out of four refugees are Azerbaijani.
* Armenian-backed separatists secured control of Nagorno-Karabakh and several surrounding regions.
* A ceasefire was signed in 1994, but no peace agreement. The status of the area is still unclear.
* The majority of the population in both Armenia and Nagorno-Karabakh are Christians and belong to the Armenian Orthodox Church. In Azerbaijan, the majority of the population is Muslim.