Herstal, formerly known as Heristal, or Héristal, is a city and municipality of Wallonia located in the province of Liège, Belgium. It lies along the Me…Herstal, formerly known as Heristal, or Héristal, is a city and municipality of Wallonia located in the province of Liège, Belgium. It lies along the Meuse river. Herstal is included in the "Greater Liège" agglomeration, which counts about 600,000 inhabitants.