The overage depth of the lake is 6,7 m, but the maximum depth – 20,8 m. The mirror square area is 360.1 ha.
Pikes, perches, eels, breams, pike perches, silver breams, roaches and burbots dwell here. Let: pike perches one-summers – 39.2 thousand (2001), breams one-summers – 39 thousand (2003), tenches one-summers – 39 thousand (2003); pikes one-summers – 5 thousand (2005). Ducks and swans have their nests here. Rushes, horsetails, cattails, sedges and spatter docks grow on the lake banks. There is a small island in the southern part of the lake.
Recreational possibilities – licensed fishing. Daily license – 1.50 EUR, month license – 4.50 EUR. Licensed fishing organizer: Viski Parish Council. The full text of the rules in the Latvian language can be found here: http://www.viski.lv/parvalde/makskeresana/.
Ostrova and Maskovska mounds are located near the lake.
On the bank of lake Viski, there is a recreation place “Viskezers” that offers recreational facilities: accommodation, sauna, camping and campfire sites, well-maintained beach, boat, catamaran and bike rental.