Many lakes in Finland and many low hills in the eastern European plain are the result of glaciation. Finland and eastern Europe have high latitudes and were once covered by glaciers. Glacier action is strong, forming many glacial lakes and moraine plains.

Ice lake is a kind of negative terrain erosion landform formed by the excavation and erosion of ancient glaciers in high mountains or high latitudes by soft or broken rock belts during their flow. It often extends in a beaded shape along the weak lithologic zone or the ne and NW structural lines. In the process of glacier movement, the concave water generated by surface excavation erosion forms lakes.

Moraine plain refers to the accumulation of debris transported by glaciers after they melt in warmer areas, forming an ice-accumulating terrain. Valdai Glacier Area in the northwest of Eastern Europe Plain is a typical moraine hilly landform. Glacier accumulation landform is very young, and it is rarely eroded by flowing water. There are messy terminal ridges, flat and flat broken plains and flat and monotonous ice water plains. On the vast moraine plain, there are many drum mounds, snake mounds and moraine mounds, as well as countless lakes. Highlands and lowlands are intertwined.