 The Low Prussian dialect predominated in East Prussia, although High Prussian was spoken in Warmia.The numbers of Masurians, Kursenieki and Prussian Lithuanians decreased over time due to the process of Germanization.The Polish-speaking population concentrated in the south of the province (Masuria and Warmia) and all German geographic atlases at the start of 20th century showed the southern part of East Prussia as Polish with the number of Polish-speakers estimated at the time to be 300,000.