Vierumäki Delta And Eskers, Heinola

The eskers in the Vierumäki area in Heinola belong to the narrowest and steepest examples of eskers formed in meltwater tunnels or cracks in the ice sheet at the end of the last ice age. Evidently, the meltwaters first drained through narrow subglacial tunnels, that later widened to glacial cracks, through which the meltwaters transported gravel and sand to the sandur and delta plains of the Second Salpausselkä at Vierumäki. Together with the small lakes of the area, the eskers form a picturesque landscape ideal for recreational purposes.