Воронежская губерния
In 1923, after a series of reforms, Voronezh Governorate consisted of twelve uyezds: Bobrovsky, Bogucharsky, Kalacheyevsky, Nizhnedevitsky, Novokhopyorsky, Ostrogozhsky, Pavlovsky, Rossoshansky, Usmansky, Valuysky, Voronezhsky, and Zadonsky. In 1924, Zadonsky, Kalacheyevsky, and Pavlovsky Uyezds were abolished.