title: Ertso Lake
text: # Ertso Lake
  
  Ertso Lake (Georgian: ერწოს ტბა) is a karst lake in the Java Municipality, Shida Kartli region of Georgia. 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 $km^2,$ while the catchment area is 5.85 $km^2.$ Average depth is 2,1 m, maximal depth is 19 m. 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". The village of Ertso is located eastern side.
  
  