While most of the population of the region speaks standard Polish, some people in the upper river basin (municipalities of Lipsk, Dąbrowa Białostocka and partly Sztabin) speak a local dialect of Belarusian (called by them prosty jazyk - "the simple language").
The fate of the Suvalkai Region was not determined by the treaty as the line was drawn only to the village of Sztabin.
Sztabin |