In Poland, zaścianek (literally: behind the wall) is a village, often where yeomanry (drobna szlachta) lives, especially in Mazovia and Podlachia. Zaściankowy means out-of-the-way or narrow-minded.
Map of %D0%97%D0%B0%D1%81%D1%82%D0%B5%D0%BD%D0%BE%D0%BA, Belarus
References
Zaścianek Wikipedia(Text) CC BY-SA