The story
Until 2000, the current region did not exist as such, but was organized as part of a larger administrative unit called the North Moravian Region. Six of its districts, Bruntál, Frýdek-Místek, Karviná, Nový Jičín, Opava, and Ostrava, were in 2000 put into the newly established Moravian-Silesian Region. The old North Moravian Region still exists and jurisdiction of some administrative bodies is defined by its borders.
From Wikipedia’s article on Moravian-Silesian Region, shared under CC BY-SA 4.0.5

