It is closely linked, with complicated borders, to the Belgian exclaves of Baarle-Hertog.Baarle-Hertog consists of 26 separate pieces of land. Apart from the main piece (calledZondereigen) located north of the Belgian town of Merksplas, there are 22 Belgianexclaves in the Netherlands and three other pieces on the Dutch-Belgian border. There are also six Dutch exclaves located within the largest Belgian exclave, one within the second-largest, and an eighth within Zondereigen. The smallest Belgian parcel, H12, measures 2,632 square meters.
The border's complexity results from a number of equally complex medieval treaties, agreements, land-swaps and sales between the Lords of Breda and the Dukes of Brabant. Generally speaking, predominantly agricultural or built environments became constituents of Brabant, other parts devolved to Breda. These distributions were ratified and clarified as a part of the borderline settlements arrived at during the Treaty of Maastricht in 1843
