Is Serbia Belgrade a vernacular region or a formal region or a functional region?

Belgrade, the capital of Serbia, can be classified as a formal region due to its established administrative boundaries and governance structure. It is defined by specific criteria, such as population density, cultural identity, and economic activities. While it may exhibit some characteristics of a functional region due to its role as a hub for commerce, transportation, and services in the surrounding area, its formal designation as a city makes it primarily a formal region.