Palaearctic formations of Carex acuta of wet, alkaline or slightly acid depressions with mineral soil; Carex acuta does not tolerate prolonged desiccation. The community is distributed, in particular, in northern France, the Low Countries, Central Europe south to the Sava and Drava valleys of Croatia, the northern Morava valley of Serbia and Romania, north to Poland, the Kaliningrad District, Lithuania and Latvia, in southern Scandinavia, in the Dnieper basin of northern Ukraine and southern Belarus, in the lower Volga Valley.