Colchis combining plain lowland is located in Western Georgia, up to 200 meters above the sea level. It has a form of a triangle with its bottom attached to the sea coast. It is a former hollow of the sea which was filled with river rocks. The western part of the lowland is sinking which is a cause of frequent flooding and marshing effect.

Colchis lowland has a small slant, therefore the flow of rivers on it is weak. They create meanders which facilitate formation of frame lakes. In the vicinity of Black sea there are marshes which are located on the routes of migrant birds.

Colchis lowland is a hub where moist (western) and dry (eastern) blowing winds mix. Eastern winds facilitate evaporation of excessive moist and good harvest. However, due to them, in summertime hot and stifling weather takes shape followed sometimes by drought and destruction of harvest.

Colchis lowland from the times immemorial was a venue of human settlement and husbandry. Ancient Greek colonies were present here, and the legend on Argonauts and Golden Fleece is also linked to Colchis. Nowadays the lowland is heavily settled (150-200 persons per sq. m) and is almost fully occupied. Natural environment here has been preserved only in the sanctuary and on the highly damp territories.