County of HainautThe County of Hainaut (Comté de Hainaut; Graafschap Henegouwen; comitatus hanoniensis), sometimes spelled Hainault, was a territorial lordship within the medieval Holy Roman Empire that straddled what is now the border of Belgium and France. Its most important towns included Mons (Bergen), now in Belgium, and Valenciennes, now in France. The core of the county was named after the river Haine. It stretched southeast to include the Avesnois region and southwest to the Selle (Scheldt tributary).
MeuseThe Meuse (mjuːz , mɜːz, USalsomɜːrz,_mʌz , møz; Moûze muːs) or Maas (mɑːs , maːs; Maos mɔːs or Maas maːs) is a major European river, rising in France and flowing through Belgium and the Netherlands before draining into the North Sea from the Rhine–Meuse–Scheldt delta. It has a total length of . From 1301 the upper Meuse roughly marked the western border of the Holy Roman Empire with the Kingdom of France, after Count Henry III of Bar had to receive the western part of the County of Bar (Barrois mouvant) as a French fief from the hands of King Philip IV.
BelgiumBelgium, officially the Kingdom of Belgium, is a country in Northwestern Europe. The country is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeast, France to the southwest, and the North Sea to the northwest. It covers an area of and has a population of more than 11.5 million, making it the 22nd most densely populated country in the world and the 6th most densely populated country in Europe, with a density of .