Issues of sub-national referendums regulated at the national level

Peru
Political Constitution of Peru (Constitución Política del Per?),
http://www.congreso.gob.pe/ntley/Imagenes/Leyes/26300.pdf
Article 190
Regions are created on the basisof contiguous areas with historical, cultural,
administrative, and economicrelations, thus comprising sustainable geo-economic unities.
The regionalization process willbegin by electing regional governments in the current
departments and theConstitutional Province of Callao. These are regional
governments. Two or morecontiguous departments may become a region by
conducting a confirmingreferendum, according to law. Likewise, two or more
contiguous provinces anddistricts may change their regional constituency by following
the same procedure.
Additional authorities andfaculties, as well as special incentives, to these newly formed
regions will be determined bylaw.
While the integration process isunderway, two or more regional governments may
create coordination mechanismsbetween them. The relevant law will regulate these