Lower Prussia is a historical region divided between Kaliningrad Oblast, Russia, and Warmian-Masurian Voivodeship, Poland. It is located within the historic region of Prussia. In the north it borders the Sambia Peninsula via the Pregolya river, on the east, the Łyna river, forming boundary with

Lithuania Minor Lithuania Minor ( lt, Mažoji Lietuva; german: Kleinlitauen; pl, Litwa Mniejsza; russian: Ма́лая Литва́), or Prussian Lithuania ( lt, Prūsų Lietuva; german: Preußisch-Litauen, pl, Litwa Pruska), is a historical ethnographic re ...

. In the south it borders Warmia and Masuria.Piotr Skórzyński: ''Warmia i polskie Dolne Prusy'', 2012.

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{{reflist Geography of Prussia Historical regions in Poland Historical regions in Russia Geography of Kaliningrad Oblast Geography of Warmian-Masurian Voivodeship