The territory known as the main part of Lithuania Minor had been distinguished in administrative terms first as Nadrauen and Schalauen, later the names "Lithuanian counties", Lithuanian Province, Prussian Lithuania or "Lithuania" ("Litauische Kreise" or "Litt(h) auen") became predominant. The administrative Lithuanian Province (part of the administrative province of Sambia) (about 10 000 km²) comprised four districts of that time: Klaipėda (Memel), Tilžė (Tilsit, Sovetsk), Ragainė (Raganita, Ragnit, Neman) and Įsrutis (Insterburg, Cerniachovsk). There were three provinces in the Duchy of Prussia overall: