What Are the Kolkheti Wetlands?

Stretching along the eastern Black Sea coast of Georgia, the Kolkheti (Colchic) wetlands form one of the most ecologically significant lowland environments in the entire Caucasus. Centred around the Rioni River delta, Paliastomi Lake, and the adjacent coastal forests, this area was designated as Kolkheti National Park in 1999 and is listed as a Ramsar Wetland of International Importance. The wetlands provide habitat for hundreds of bird species, support rare and endemic flora, and serve as a critical corridor on the East Atlantic–Black Sea migratory flyway.

Biodiversity of Note

The Kolkheti wetlands are home to species found nowhere else in the region:

  • Relict Colchic Forest: Fragments of subtropical broadleaf forest containing species like Caucasian zelkova (Zelkova carpinifolia), Colchic holly (Ilex colchica), and several fern species of ancient lineage.
  • Migratory Waterbirds: Dalmatian pelicans, pygmy cormorants, ferruginous ducks, and a range of wader species use the wetlands as stopover and wintering grounds.
  • Fish: Migratory sturgeons, including the critically endangered ship sturgeon (Acipenser nudiventris), historically used the Rioni as a spawning route.

The Main Threats

Hydrological Modification

Dams and water extraction on the Rioni and its tributaries have significantly altered the river's natural flow regime. Reduced peak flows mean less frequent floodplain inundation — a process critical to the health of delta wetlands. Sedimentation patterns have also changed, affecting shoreline dynamics around Paliastomi Lake.

Pollution

Agricultural runoff, industrial effluent from nearby facilities, and inadequate wastewater treatment in the Poti area contribute to water quality problems in both the river and the lake. Elevated nutrient levels promote algal growth and reduce oxygen availability for aquatic life.

Invasive Species

Several invasive plant species, including the North American water hyacinth and various invasive grasses, have established themselves in and around the wetlands, outcompeting native vegetation and altering habitat structure.

Illegal Fishing and Hunting

Despite legal protections, illegal netting of migratory fish and hunting of protected bird species remain ongoing problems, particularly during migration season when large numbers of birds concentrate in the wetlands.

What's Being Done

Several initiatives are working to address these challenges:

  1. Kolkheti National Park Management: The park authority works with rangers to patrol protected zones, enforce regulations, and engage local communities in conservation.
  2. International Partnerships: Georgian conservation organisations collaborate with EU-funded programmes and international NGOs to monitor biodiversity and develop sustainable land-use plans.
  3. Community Engagement: Local fishermen and farmers are increasingly involved in conservation planning, recognising the link between healthy wetlands and their own livelihoods.
  4. Sturgeon Conservation Projects: Hatchery programmes and fishing moratoria have been introduced to support the recovery of threatened sturgeon populations in the Rioni system.

How You Can Help

Visitors to the Kolkheti wetlands can contribute positively by staying on marked trails, not disturbing nesting birds, supporting locally operated eco-tourism businesses, and reporting any signs of illegal activity to the national park authority. Raising awareness of this remarkable ecosystem — among friends, in travel writing, and on social media — also plays a genuine role in building the public and political will needed for lasting conservation.