What is "pajottenland"

The Pajottenland (in English occasionally Payottenland) is a part of the Flemish Brabant province west of the Brussels Capital Region. The Pajottenland is predominantly farmland, with occasional gently rolling hills, and lies mostly between the rivers Dender and Zenne / Senne. The area has historically provided food and drink for the citizens of Brussels, especially Lambic beers, which are only produced here and in the Zenne valley where Brussels is.