New East Prussia

New East Prussia (Neuostpreußen; Prusy Nowowschodnie; Naujieji Rytprūsiai) was a province of the Kingdom of Prussia from 1795 to 1807. It was created out of territory annexed in the Third Partition of the Polish–Lithuanian Commonwealth and included parts of Masovia, Podlaskie, Trakai voivodeship and Žemaitija. In 1806 it had 914,610 inhabitants with a territory of less than 55,000 km2, mainly Poles, Lithuanians, Jews and Belarusians.

Geography
New East Prussia encompassed territory between East Prussia and the Vistula, Bug, and Neman rivers.

1807 Treaties of Tilsit
Following Napoleon Bonaparte's victory in the War of the Fourth Coalition and the Greater Poland Uprising of 1806 the Province of New East Prussia was ceded according to the 1807 Treaties of Tilsit:
 * The area around Białystok was ceded to the Russian Empire, becoming the Belostok Oblast.
 * The Płock Department and the remainder of the Białystok Department (Łomża Department) became part of the Duchy of Warsaw, a French client state

Administrative divisions
New East Prussia was divided into the Kammerdepartements of Bialystok and Płock which were divided into the following Kreise (districts):


 * Białystok Department
 * Bialystok
 * Bielsk
 * Bobrz
 * Dombrowa
 * Drohiczyn
 * Kalwary
 * Lomza
 * Mariampol
 * Surasz
 * Wygry
 * Płock Department
 * Lipno
 * Mlawa
 * Ostrolenka
 * Plozk
 * Przasnik
 * Pultusk
 * Wyszogrod