Midden-Groningen is a municipality with a population of 60,953 in the province of Groningen, Netherlands. The municipality was formed by …Midden-Groningen is a municipality with a population of 60,953 in the province of Groningen, Netherlands. The municipality was formed by the merger of former municipalities of Hoogezand-Sappemeer, Slochteren and Menterwolde on 1 January 2018 in the context of the municipal redivision in the province of Groningen 2013–2018.