Chilka Lake

Chilka Lake
Name	Chilka Lake
Location	Odisha, India
Type	brackish lagoon
Inflow	Daya River, Bhargavi River
Outflow	Bay of Bengal
Basin countries	India
Area	~1,100 km² (varies seasonally)
Max depth	~4 m
Elevation	sea level

Chilka Lake Chilka Lake is a large brackish lagoon on the eastern coast of India in Odisha, separated from the Bay of Bengal by a thin barrier island and connected through a narrow mouth. The lagoon supports extensive fisheries, migratory waterfowl and a mosaic of habitats including mangroves, mudflats and islands. It is recognized by multiple national and international bodies for its ecological importance and has been the focus of scientific study, resource management and cultural traditions.

Geography

The lagoon lies in the coastal plain of Odisha near the city of Puri and the port town of Gopalpur-on-Sea, stretching across parts of the districts of Puri district and Khordha district and adjacent to Ganjam district. The shoreline features barrier islands such as the mouth spit near Paradip and seasonal sandbars shaped by the Bay of Bengal tidal regime and the annual monsoon cycle driven by the Indian Ocean Dipole and the Southwest Monsoon. Surrounding human settlements include villages in Bhubaneswar hinterlands and traditional fishing hamlets linked historically to the kingdoms of Kalinga and colonial centers like Bengal Presidency. Major nearby transport hubs include Biju Patnaik International Airport and the rail network connecting to Howrah and Chennai.

Hydrology and Water Chemistry

The lagoon receives freshwater from rivers such as the Daya River and the Bhargavi River as well as episodic runoff from the Mahanadi distributaries, while exchanging saltwater with the Bay of Bengal through a single inlet whose cross-section varies with storms and human interventions. Seasonal salinity gradients result from inputs related to the Southwest Monsoon and tidal forcing associated with the Bay of Bengal amphidromic system, producing brackish conditions that range from near-fresh in upper basins to marine near the mouth. Sediment dynamics are influenced by longshore drift along the Coromandel Coast and episodic cyclone-induced overwash events linked to cyclone systems tracked by the India Meteorological Department. Water chemistry parameters such as dissolved oxygen, nutrient concentrations and turbidity have been monitored historically by agencies including the Zoological Survey of India and the Central Inland Fisheries Research Institute.

Ecology and Biodiversity

The lagoon sustains diverse assemblages including estuarine fishes, crustaceans and molluscs exploited by fisheries associated with institutions like the Central Marine Fisheries Research Institute. Its wetlands provide crucial staging and wintering habitat for migratory birds from the Central Asian Flyway and the East Asian–Australasian Flyway, hosting species observed by ornithologists from the Bombay Natural History Society and the Wetlands International network. Vegetation zones include mangrove patches dominated by genera documented in surveys by the Botanical Survey of India and tidal marshes supporting invertebrate communities studied by researchers at IIT Kharagpur and Orissa University of Agriculture and Technology. The lagoon’s islands and mudflats are breeding grounds for species protected under national statutes and listed in inventories curated by the Ministry of Environment, Forest and Climate Change.

Human Use and Economy

Local economies rely on artisanal fisheries, aquaculture ponds and salt pans operated by cooperative societies and private entrepreneurs affiliated with regional offices of the Fisheries and Animal Resources Department, Odisha and marketed through trade links to urban centers like Kolkata and Visakhapatnam. Tourism around pilgrim sites in Puri and eco-tourism initiatives promoted by state agencies bring visitors to birdwatching and boat tours launched from villages registered with the Odisha Tourism Development Corporation. Traditional livelihoods include reed harvesting and boatbuilding by communities historically linked to the Maratha and Bengal coastal networks. Infrastructure projects such as roads and small ports have been proposed or implemented by agencies including the National Highways Authority of India, affecting access and commerce.

History and Cultural Significance

The lagoon’s shores have been part of historical polities such as Kalinga and encountered colonial administrations including the British Raj and the Bengal Presidency, with trade ties to Gujarat and Chennai ports. It features in regional cultural practices surrounding the Jagannath tradition centered in Puri and local folklore recorded by scholars from institutions like Utkal University. Archaeological surveys coordinated with the Archaeological Survey of India have documented material culture along littoral settlements reflecting centuries of fishing, salt production and pilgrimage. Conservation designations have intersected with customary rights of fisher communities, creating contested histories involving regional courts and policy bodies like the National Green Tribunal.

Conservation and Management

The lagoon is designated under international frameworks administered by bodies such as the Ramsar Convention and has been listed by national authorities including the Ministry of Environment, Forest and Climate Change as a protected wetland, leading to management plans developed with stakeholders like the Odisha Forest Department and nongovernmental organizations including Wetlands International and local chapters of the World Wide Fund for Nature. Challenges addressed in management plans include overfishing, siltation driven by upstream land use changes in catchments monitored by the Central Water Commission, and habitat loss from coastal development overseen by the Coastal Regulation Zone regime. Restoration projects have involved scientific partners such as IIT Bhubaneswar and international donors coordinating adaptive management, community co-management arrangements and monitoring programs aligned with sustainable development objectives set by the United Nations Environment Programme.

Category:Lagoons of India Category:Odisha geography