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Prątnik [ˈprɔntnik] (German: Marienfelde) is a settlement in the administrative district of Gmina Braniewo, within Braniewo County, Warmian-Masurian Voivodeship, in northern Poland, close to the border with the Kaliningrad Oblast of Russia. It lies approximately 4 kilometres (2 mi) south-west of Braniewo and 78 km (48 mi) north-west of the regional capital Olsztyn.
Before 1945 the area was part of Germany (East Prussia). Following World War II the native German populace was expelled and replaced by Poles.
The settlement has a population of 3.