Ertso Lake (), () is a karst lakeLevan Maruashvili, Physical Geography of Georgia (in georgian), p. 66. Tbilisi, "Tsodna", 1964.Ilia Apkhazava, Encyclopedia Georgia (multi-volume edition), third volume, p. 95, Tbilisi, 2014 in the Java Municipality, Shida Kartli region of Georgia.Orthographic dictionary of geographic names of Georgian, p. 64, Tbilisi, 2009 Located in Qvirila river basin, north-west side of the Ertso-Tsona depression, at 1710 m above sea level. Lake Ertso is the biggest known karst lake in Georgia. The area of surface is 0.31 km2, while the catchment area is 5.85 km2. Average depth is 2,1 m, maximal depth is 19 m.Ilia Apkhazava. Lakes of Georgia (in russian), pp. 124–127, Tbilisi, "Metsniereba", 1975 The shape of the shore line is complicated. Three permanent rivers inflows of the lake. Lake Ertso extends in a roughly longitudinal direction. Four sinkholes are filled with water. Gets its feed from snow, rainfall and underground waters. The lake surface water temperature is 23–25 °C. The water level is high during May and June and is low during August and September. The lake freezes for almost 5 months in winter. Lake Ertso is included in the "Red List of Georgia".Red Book of Georgia (in georgian), p. 218, Tbilisi, "Sabchota Saqartvelo", 1982 The village of Ertso is located eastern side.
See also List of lakes of Georgia
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