Łomża Land

Łomża Land (Polish: ziemia łomżyńska), named after the town of Łomża, was an administrative unit (ziemia) of the Duchy of Masovia, and after [[ the Kingdom of Poland and the Polish–Lithuanian Commonwealth.

It was part of Masovian Voivodeship, and existed from the 14th century until the Partitions of Poland.

Łomża Land was the largest province of the historic region of Mazovia.

In 1379, Siemowit III, Duke of Masovia divided the Duchy of Mazovia between his sons, granting Łomża to Janusz I of Warsaw.

kilometers, and was divided into four counties: Łomża, Kolno, Zambrów and Ostrołęka.