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Lake Čertoka, or Velnezers, is a 53-hectare nature reserve established in 1977, whose greatest value is its mysterious and unique lake.
The lake was formed in a funnel-shaped suffosion depression and reaches a depth of up to 17 meters. Its slopes are covered with dry coniferous forests, which are a protected forest habitat in Europe. One of the main values of the Čertoka Lake Nature Reserve is its landscape and distinctive relief.
The main manager of the lake, the joint-stock company “Latvijas valsts meži,” in cooperation with Daugavpils University, has created a developed trail near Velnezers, which also helps to preserve and protect the beautiful scenery around the lake.