Kalja study trail introduces karst forms and their causes. Waters that go underground in Kalja sinkholes run as a subterranean river and appear on the ground again near Jauni village, Hiieniidi (Iilasmaa) spring area, to the north of Kalja sinkholes.
Marked hiking trail (blue markings), with descriptions of points of interest.
Papildus informācija RMK mājaslapā
Дополнительная информация здесь