Krajna is a forested historical region in the north of Greater Poland in Poland, situated in the border area between the Greater Poland, Kuyavian-Pomeranian and Pomeranian Voivodeships. The region consists of parts of Złotów, Piła, Sępólno, Nakło, Bydgoszcz and Człuchów counties, namely the urban gmina of Złotów, the rural gmina of Złotów and the urban-rural gminas of Krajenka, Wysoka, Wyrzysk, Łobżenica, Kamień Krajeński, Sępólno Krajeńskie, Więcbork, Nakło nad Notecią, Koronowo and Debzno. The name of Krajna is derived from the Slavic word for borderland, cf. Krajina.

Więcbork is a town in northern Poland, located in the Sępólno County in the Kuyavian-Pomeranian Voivodeship. In 2019 it had a population of 5,965. It is located on the shores of Więcborskie Lake within the ethnocultural region of Krajna.