The Wołyń voivodeship was located at the south-eastern corner of Poland, bordering the Soviet Union to the east, the Lublin Voivodeship to the west, the Polesie Voivodeship to the north, and the Lwów and Tarnopol Voivodeships to the south.
Initially, the Voivodeship’s area in the new Poland was 30,276 square kilometres.
On 16 December 1930, Sarny County, comprising 5,478 km² of land, was transferred from Polesie Voivodeship to the Wołyń Voivodeship.
As a result, the total area of the Wołyń Voivodeship increased to 35,754 km², making it Poland's second largest province.

The landscape was flat and hilly for the most part.
In the north, there was a flat strip of land called Volhynian Polesie, which extended some 200 kilometres from the Southern Bug river to the Polish-Soviet border.
The landscape in the south was more hilly, especially in the extreme south-east corner around the historical town of Krzemieniec, in the Gologory mountains.
The province's main rivers were the Styr, the Horyń, and the Słucz.
The Wołyń voivodeship was located at the south-eastern corner of Poland, bordering the Soviet Union to the east, the Lublin Voivodeship to the west, the Polesie Voivodeship to the north, and the Lwów and Tarnopol Voivodeships to the south. Initially, the Voivodeship’s area in the new Poland was 30,276 square kilometres. On 16 December 1930, Sarny County, comprising 5,478 km² of land, was transferred from Polesie Voivodeship to the Wołyń Voivodeship. As a result, the total area of the Wołyń Voivodeship increased to 35,754 km², making it Poland's second largest province.
The landscape was flat and hilly for the most part. In the north, there was a flat strip of land called Volhynian Polesie, which extended some 200 kilometres from the Southern Bug river to the Polish-Soviet border. The landscape in the south was more hilly, especially in the extreme south-east corner around the historical town of Krzemieniec, in the Gologory mountains. The province's main rivers were the Styr, the Horyń, and the Słucz.
Wołyń Voivodeship (1921–1939)