the city ,in the Vecht valley of the Salland region is at the heart of what Provence, was a commercial and defensive confederation of merchant guilds and their market towns ?
Overijssel
Title: Market towns of Vestfold county
Passage: The Market towns of Vestfold county (Norwegian: "Kjøpstedene i Vestfold fylke" ) was an electoral district for parliamentary elections in Norway.  It comprised the market towns (Norwegian: "kjøpsteder" ) of Holmestrand, Horten, Tønsberg, Sandefjord and Larvik in Vestfold county.
Title: Hanseatic League
Passage: The Hanseatic League (also known as the Hanse or Hansa; Middle Low German: "Hanse", "Deutsche Hanse", Latin: "Hansa", "Hansa Teutonica" or "Liga Hanseatica ") was a commercial and defensive confederation of merchant guilds and their market towns.  Growing from a few North German towns in the late 1100s, the league came to dominate Baltic maritime trade for three centuries along the coast of Northern Europe.  It stretched from the Baltic to the North Sea and inland during the Late Middle Ages and declined slowly after 1450.
Title: Ommen
Passage: Ommen (] ) is a municipality and a Hanseatic city in the Vecht valley of the Salland region, which is at the heart of the province of Overijssel in the eastern Netherlands.  Historical records first name Ommen in the early 12th century and it was officially founded as a city in 1248.  The municipality had a population of in and covers an area of data missing km2 .
Ommen Hanseatic League