Belarus–Poland border

After the Soviet invasion of Poland in September 1939, the area of West Belarus was annexed into the Byelorussian Soviet Socialist Republic. Five new Voblasts were created: Baranavichy, Belostok, Brest, Pinsk, and Vialejka.

In accordance with the Border Agreement between Poland and the USSR of 16 August 1945, 17 districts of Belastok Voblast of the BSSR including the city of Białystok and 3 districts of Brest Voblast, where a significant number of Poles lived, were transferred to Poland.

On November 5, 1945, an additional agreement was signed in Warsaw by representatives of the government of the Byelorussian Soviet Socialist Republic and the Government of the National Unity of the Republic of Poland on the registration and evacuation of the Belarusian population from the territory of Poland to the BSRR and Polish population from the BSRR to the territory of Poland. Announcements on registration and extension of the evacuation until June 1946 were posted in Białystok and within the Voivodship.[5]

In 1946, during the refinement of the state border between the USSR and Poland in the Belarusian-Polish section, Krynek, which was entirely granted to Poland, had a point that separated the border section under Sub-Committee V from the activities of Sub-Committee VI. Further, the border ran through areas which Poland lost due to the Soviet dictate, because they were located on the west side of the Curzon Line. This shift was around 12 km in the vicinity of Odelsk, 15 km in the Łosośny area, 20 km in Biała Blota, and 15 km in the area of the Augustów Canal. Polish negotiators during the delimitation procedure realized that they were helpless in the face of these imposed arrangements and were only trying to introduce minor verifications for Poland. Among other things, near Odelsk, within the borders of Poland was the village of the villages of Klimówka, Minkowce, Nomiki, Taki, Tołcze, Szymaki of the Hrodna District and the villages of Todorkowce and Chworosciany of the Sapotskin district were transferred to the Polish People's Republic. Zubrzyca Wielka and Zubrzyca Mała were also recovered, but most of the agricultural lands belonging to these villages remained on Belarusian side of the border.

More to the north, in the area of the village of Nowrowol the border was moved 700-800m to the east, which also allowed the villages of Tołcze, Szymaki and Klimówka to be part of Poland. In the Gmina Kuźnica, the border line was moved 200-300m to the east and at this place the border was cut across the tracks of the Białystok-Grodno railway line.

In August 1948, the TASS agency announced a communication on the completion of delimitation of the border. However, the local authorities determined the final shape of the border and belonging of individual villages or their fragments for more than a year and a half. On the basis of documentation of the Belarusian side, officially announced on July 8, 1950, the Polish side obtained 30 villages as part of exchange and border corrections, while the Belarusian side obtained 12 villages. Also, many villages have been divided. Thereafter, and until now, the border between Poland and Belarus has never changed.