|Department of the Duchy of Warsaw|
Administrative division of the Duchy of Warsaw, 1810-1815. ?om?a Department is brown in the north-east
?om?a Department (Polish: Departament ?omzy?ski) was an administrative division and local government in the Polish Duchy of Warsaw in the years 1807-15. The Department comprised 10 counties and had its capital at ?om?a.
From January to July 1807 the Department was known as the Bia?ystok Department (Departament Bia?ostocki), with its capital at Bia?ystok. However, after the Treaties of Tilsit, the Russian Empire agreed to the creation of the Duchy of Warsaw; but in exchange the Department ceded four counties: Bia?ostocki, Bielski, Sokólski, and Drohicki. Thus the Department's capital had to be moved, and its name was accordingly changed to that of the new capital, ?om?a.
It was divided into 7 counties: