Hairy Willowherb (Epilobium hirsutum), fam. Onagraceae.
Grows in the forest, along the banks of the lakes. It is a relative of Fireweed (that is also sometimes called willowherb, but usually attributed to the Chamaenerion genus) and Evening primrose. It it similar to them with its high straight shoots with narrow leaves, and rather large flowers with 4 petals. These flowers appear in the end of June and arranged one by one, having attractive pink color. The plants actually don't have any special "hairiness".
Willowherb has hemostatic, astringent, antiinflammatory properties, particularly for urogenital diseases. It is not toxic, and contains vitamins.
Maybe, some photos are related to a similar species Hoary (Smallflower) Willowherb (Epilobium parviflorum).