Question: 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 ?
Sentence (from "Hanseatic League"): 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.
Relevant evidence: Yes