Lake KäsmuLake Käsmu is a lake in Estonia. It is located in the villages of Eru and Käsmu in Haljala Parish, Lääne-Viru County. Lake Käsmu is located on the southern edge of the Käsmu Peninsula in northern Estonia.Physical descriptionThe lake has an area of. The lake has an average depth of and a maximum depth of. It is long, and its shoreline measures. It has a volume of. It has diverse vegetation in terms of the number of species: there are 22 types of macrophytes.