Abstract: Hydrochemical investigations during a period, longer than one year, has shown the seasonal changes onthe brine of the Salt Lake (Central Anatolia-Turkey). Two water bodies, separated by a sill, have different chemicalcompositions. The shallow main lake has the concentration around 300-350 g/1 of dissolved material, while the deeperregion has only 80 g/1. At the end of summer, brine concentration reaches to 9,4 g/1 K + ,25,3- g/1 Mg++,640 mg/1Br-,340 mg/1 B and 305 mg/1 Li+. The seasonal concentration values of the several cations and anions and theireffects on the mineralization are discussed.