Valdis Pilāts and Māris Laiviņš, "Historical Parallels of Moricsala and Lagodekhi&mdash;Two 100-Year Old Protected Nature Areas in Latvia and Georgia" , Acta Biologica Universitatis Daugavpiliensis 13.2 (2013) 111 35, 1407-8953, p. 112 (pdf) The major rivers flowing through the reserve are the Ninoskhevi, Shromiskhevi, Lagodekhistskali and Matsimistskali; at the higher elevations there are glacial lakes, of which the largest is Black Cliff Lake, on the Russian border, with a depth of 14 meters .