kolkheti wetlands are represented by the deep tectonic depression, filled with thick (8 km wide) layer of disintegrated materials. The surface was formed in the second half of the Holocene époque and are formed mainly with sediments of marine, wetland - reverie and lake genesis.
The morphology is very simple and is characterised by almost ideally flat surface, which is slightly declined towards the sea. Near and along the whole sea coastline the relief is formed by coastal dunes of marine-accumulative origin (width varying between 100-300m and height - 1.5-3.5m). Eastern parts of the coastal dunes are occupied by marshes and are subdivided by river mouths in separate sections (Pichora-Paliastomi, Nabada (Chaladidi) and Anaklia-Churia).
kolkheti wetlands is an ecosystem of natural origin. Submerging rate is almost 3.1 mm/year near village Chaladidi and reaches 6.5 mm near Poti. Submerging process is supported by excessive accumulation. The territory is characterised by dense river network.
Among them lake Paliastomi should be mentioned, that is located to the South of Rioni delta. Lake Paliastomi is typical lagoon lake, which is isolated from the sea by 300-400m wide and 2m height sandy barrier (surface area of the lake is 18.2sq. km, watershed area 547 sq. km, maximal depth-3.2m, average-2.6m, water volume - 52 mill. cub. m). Within the wetland territories there are many other smaller lakes: lakes Imnati (area-0.06 sq. km, depth-2m), Maltakva (area-0.03sq.km, depth-6.5m), Grigoleti (area-0.10 sq.km, depth-5m). Currently these lakes suffer from sedimentation and growth of under water plants.
The territories are represented by hydromorphic and alluvial-hydromorphic soil types. Soil formation process in accordance with prevailing natural circumstances is represented by mineral-wetland and organic-mineral-wetland soils. The water is hydrocarbonic and contains Cl, Na, Mg, Ca. The water levels fluctuate in following ranges: wetlands - 0.2-0.7m, lakes - 0.5-3m, rivers - 1-12m.
14C degree (min. -13 -17C, max. +41C)