ENThis article presents the state of research in the field of studies on Borderland Polish afer 2015. The author provides an overview of selected publications which concern the situation of the Polish language in Belarus, Lithuania, Ukraine and in the borderlands, discusses the issues and research problems they consider, and outlines the main areas of research. The article focuses on the contribution of Janusz Rieger to this field of study and on his latest monograph: Język polski na Kresach [The Polish Language in the Eastern Borderlands], published in 2019.