Bulgaria is a unitary state. Since the 1880s, the number of territorial management units has varied from seven to 26. Between 1987 and 1999, the administrative structure consisted of nine provinces (oblasti, singular oblast).
Bulgaria is a unitary state with its territorial organization changing over time. From the 1880s to 1999, it had varying numbers of administrative units, ranging from seven to 26, and then transitioned to nine provinces as its primary administrative divisions.