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Province of New East Prussia
*Provinz Neuostpreußen* (German)
Province of New East Prussia Provinz Neuostpreußen (German)
Province of Kingdom of Prussia
1795–1807
	; New East Prussia in 1806
Capital	Białystok
Area
• 1806	55,000 km2 (21,000 sq mi)
Population
• 1806	914,610
History
• Third Partition	24 October 1795
• Treaty of Tilsit	9 July 1807
Political subdivisions	Bialystok; Plozk
Preceded by	Succeeded by
	Masovian Voivodeship (1526–1795)
	Podlaskie Voivodeship (1513–1795)
	Trakai Voivodeship
Duchy of Warsaw
Russian Empire
Today part of	Poland; Lithuania; Belarus¹
	¹ Sopoćkinie area

New East Prussia (German: Neuostpreußen; Polish: Prusy Nowowschodnie; Lithuanian: 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 (21,000 sq mi), mainly Poles, Lithuanians, Jews and Belarusians.

Geography

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

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