Issues in relation to which referendums are mandatory at the national level

Azerbaijan
- Constitutional amendments
- Any change in state borders
Constitution of the Republic of Azerbaijan:
Article3.
Questions solved by way of nation-wide voting-referendum
I.People of Azerbaijan may solve any questions involving their rights andinterests by way of referendum.
II.The following questions may be solved only by way of referendum:
1.acceptance of the Constitution of the Azerbaijan Republic and introduction ofamendments thereto;
2.change of state borders of the Azerbaijan Republic
http://azerbaijan.az/portal/General/Constitution/doc/constitution_e.pdf