Question: Which Soviet era raion was the second most populous division formed from ?

text: Republic of Artsakh
Administrative divisions
Main article : Administrative divisions of the Republic of Artsakh Regions of Artsakh:1 : Shahumyan ; 2 : Mardakert ; 3 : Askeran ; 4 : Martuni ; 5 : Hadrut ; 6 : Shushi ; 7 : Kashatagh . ( Stepanakert not shown . ) Main cities and towns in Artsakh The Republic of Artsakh has eight administrative divisions . Their territories include the five districts of the former Nagorno-Karabakh Autonomous Oblast ( NKAO ) , the Shahumyan Region in the Azerbaijan SSR which is currently under Azerbaijani control , and the seven districts around the former NKAO that are under the control of the Artsakhi forces . Following the Nagorno-Karabakh Republic 's declaration of independence , the Azerbaijani government abolished the NKAO and created Azerbaijani districts in its place . As a result , some of the Republic of Artsakh 's divisions correspond with the Azerbaijani districts , while others have different borders . A comparative table of the current divisions of Artsakh and the corresponding districts of Azerbaijan follows : [ 111 ]
The Republic of Artsakh (/ˈɑːrtsɑːx/; Armenian: Արցախի Հանրապետություն, Artsakhi Hanrapetut'yun), or simply Artsakh, also known by its second official name, the Nagorno-Karabakh Republic (/nəˌɡɔːrnoʊ kɑːrəˈbɑːk/), is a breakaway de facto state in the South Caucasus that is internationally recognized as part of Azerbaijan. The region is currently populated mostly by Armenians and the primary spoken language is Armenian. Artsakh controls most of the territory of the former Nagorno-Karabakh Autonomous Oblast and some of the surrounding area, giving it a border with Armenia to the west and Iran to the south. Its capital is Stepanakert. The predominantly Armenian-populated region of Nagorno-Karabakh was claimed by both the Azerbaijan Democratic Republic and the First Republic of Armenia when both countries became independent in 1918 after the fall of the Russian Empire, and a brief war over Nagorno-Karabakh broke out in 1920. The dispute was largely shelved after the Soviet Union established control over the area and created the Nagorno-Karabakh Autonomous Oblast (NKAO) within the Azerbaijan SSR in 1923. During the fall of the Soviet Union, the region re-emerged as a source of dispute between Armenia and Azerbaijan. In 1991, a referendum held in the NKAO and the neighbouring Shahumian region resulted in a declaration of independence based on its right of self-determination. A large-scale ethnic conflict led to the 1991-1994 Nagorno-Karabakh War, which ended with a ceasefire. Artsakh is a presidential democracy (in the middle of transforming from a semi-presidential democracy after a 2017 referendum) with a unicameral legislature. Some have said that its reliance on Armenia means that, in many ways, it functions de facto as part of Armenia. The country is very mountainous, averaging 1,097 metres (3,599 ft) above sea level.
# Artsakh Division Population ( 2005 ) Azerbaijan Rayon ( s ) Sahar ( city ) Former NKAO ?
1 Shahumyan Region 2,560 Southern Goranboy , Western Kalbajar Kalbajar ( formerly Shahumian ) No
2 Martakert Region 18,963 Eastern Kalbajar , Western Tartar , portion of Agdam Martakert Partially
3 Askeran Region 16,979 Khojali , portion of Agdam Askeran Partially
4 Martuni Region 23,157 Northern Khojavend , portion of Agdam Martuni Partially
5 Hadrut Region 12,005 Southern Khojavend , Jabrayil , portion of Fizuli Hadrut Partially
6 Shushi Region 4,324 Shusha Shushi Yes
7 Kashatagh Region 9,763 Lachin , Qubadli , Zangilan Berdzor No
8 Stepanakert ( capital ) 49,986 Khojali Stepanakert Yes