Donji Kraji

Donji Kraji ("Lower Regions" or "Lower Ends") or Olfeld (In ), known in Latin as Partes inferiores ("Lower Parts"), was a small medieval region in present-day northwestern Bosnia and Herzegovina, on the southwestern size of Bosanska Krajina.
Name and geography.
At first, "Donji Kraji" referred to a region around Ključ on the Sana. From the 13th century on, the region was more often called "Donji kraji Slavonije" than "Donji kraji Bosne" or "Donji kraji Bosanski".
The territory of Donji Kraji in the 13th century included the parishes: Uskoplje, Pliva, Luka, Vrbas, Zemljanik (Resnik), Vrbanja, Tribava (Trijebovo), Mel, Lušci and Banjica. During the reign of Hrvoje, Donji Kraji merged with Sana, Glaž, Vrbas (which has since been lost), and briefly Dubica.