Issues of sub-national referendums regulated at the national level

Kazakhstan
Answer
None
Source
Law on Referendum (1995, last amended in 2008)
http://aceproject.org/ero-en/regions/asia/KZ/kazakhstan-constitutional-law-on-referenum-1995/view
Article 3. Questions that cannot be the subject of therepublican
referendum
The following questions shall not be the subject ofreferendum:
[…]
3) administrative-territorial structure and borders ofthe Republic;
[…]