The administrative seat of this zemlja was Srebrenik, which also served as residence for its rulers for entire period of existence of the medieval Bosnian state.

Usora was the northernmost Bosnian land (zemlja), occupying very fertile Pannonian Plain, and its geographical location roughly correspond to modern-day Northern Bosnia gravitating toward Posavina.

Its territory stretched roughly from the area of Kulaši and Prnjavor to its west, to Srebrenik and Lukavac to its east, the river Sava to its north and Žepče to its south.

[citation needed] The region of Usora was first mentioned in a bull (decree) dated 20 July 1244 by the King Bela IV of Hungary, in which he assigned some properties to the Bishop of Bosnia, naming the territories: quod episeopus (Bosnensis) et capitulum decimas in Vozora, in Sou, in Olfeld et in aliis supis ... habeant et percipiant (Vozora referring to Usora, Sou to Soli, and Olfeld to Donji Kraji).

Because of its geographical location, descending from the region of low hills in its south ends and spreading through north-Bosnian lowlands into the fertile Pannonian plains towards the Sava River, Usora had rich agriculture based economy.