Chundikkulam Lagoon is a lagoon

Lagoon

A lagoon is a body of shallow sea water or brackish water separated from the sea by some form of barrier. The EU's habitat directive defines lagoons as "expanses of shallow coastal salt water, of varying salinity or water volume, wholly or partially separated from the sea by sand banks or shingle,...

 in Jaffna District

Jaffna District

Jaffna district is one of the 25 administrative districts of Sri Lanka. The district is administered by a District Secretariat headed by a District Secretary appointed by the central government of Sri Lanka. The headquarters is located in Jaffna city. Parts of the district were transferred to...

 and Kilinochchi District

Kilinochchi District

Kilinochchi district is one of the 25 administrative districts of Sri Lanka. The district is administered by a District Secretariat headed by a District Secretary appointed by the central government of Sri Lanka. The headquarters is located in Kilinochchi town...

, north-east Sri Lanka

Sri Lanka

Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka is a country off the southern coast of the Indian subcontinent. Known until 1972 as Ceylon , Sri Lanka is an island surrounded by the Indian Ocean, the Gulf of Mannar and the Palk Strait, and lies in the vicinity of India and the...

. The town of Chundikkulam is located on a narrow piece of land between the lagoon and the Indian Ocean

Indian Ocean

The Indian Ocean is the third largest of the world's oceanic divisions, covering approximately 20% of the water on the Earth's surface. It is bounded on the north by the Indian Subcontinent and Arabian Peninsula ; on the west by eastern Africa; on the east by Indochina, the Sunda Islands, and...

. The lagoon is sometimes referred to as Elephant Pass Lagoon.

The lagoon is fed by a number of small rivers from the south, including Kanakarayan Aru

Kanakarayan Aru

Kanakarayan Aru is a river in Northern Province, Sri Lanka. The river rises in eastern Vavuniya District, near Omanthai, before flowing north through Vavuniya District, Mullaitivu District and Kilinochchi District. The river empties into the Chundikkulam Lagoon.-References:...

, Netheli Aru

Netheli Aru

Netheli Aru is a river in Northern Province, Sri Lanka. The river rises in central Mullaitivu District, before flowing north through Mullaitivu District and Kilinochchi District. The river empties into Chundikkulam Lagoon.-References:...

 and Theravil Aru

Theravil Aru

Theravil Aru is a river in Northern Province, Sri Lanka. The river rises in central Mullaitivu District, before flowing north through Mullaitivu District and Kilinochchi District. The river empties into Chundikkulam Lagoon....

. It used to be linked to Jaffna Lagoon

Jaffna Lagoon

Jaffna lagoon is a large lagoon off Jaffna District and Kilinochchi District, northern Sri Lanka.The lagoon is surrounded by the densely populated Jaffna peninsula containing palmyra palms, coconut plantations, and rice paddies. There are numerous fishing villages and some salt pans.The lagoon has...

 but since the construction of the causeway

Causeway

In modern usage, a causeway is a road or railway elevated, usually across a broad body of water or wetland.- Etymology :When first used, the word appeared in a form such as “causey way” making clear its derivation from the earlier form “causey”. This word seems to have come from the same source by...

 at Elephant Pass

Elephant Pass

Elephant Pass, Northern Province, Sri Lanka is an important military base and formerly the island's largest salt field, located in the gateway of Jaffna Peninsula. It has thus regularly been the site of battles during the civil war....

 the lagoon has in effect been a lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

. The lagoon's water is brackish.

The lagoon is surrounded by palmyra palm

Borassus flabellifer

Borassus flabellifer, the Asian Palmyra palm, Toddy palm, Sugar palm, or Cambodian palm, is native to South and Southeast Asia, in the Indomalaya ecozone...

 plantations and scrubland. The land is used for prawn

Prawn

Prawns are decapod crustaceans of the sub-order Dendrobranchiata. There are 540 extant species, in seven families, and a fossil record extending back to the Devonian...

 fishing

Fishing

Fishing is the activity of trying to catch wild fish. Fish are normally caught in the wild. Techniques for catching fish include hand gathering, spearing, netting, angling and trapping....

 and some salt

Salt

In chemistry, salts are ionic compounds that result from the neutralization reaction of an acid and a base. They are composed of cations and anions so that the product is electrically neutral...

 production.

The lagoon has small areas of mangrove swamp and sea grass beds. The lagoon attracts a wide variety of water bird

Water bird

The term water bird or waterbird is used to refer to birds that live on or around water. Some definitions apply the term especially to birds in freshwater habitats, though others make no distinction from birds that inhabit marine environments. In addition, some water birds are more terrestrial or...

s including storks, ibis

Ibis

The ibises are a group of long-legged wading birds in the family Threskiornithidae....

, ducks, coot

Coot

Coots are medium-sized water birds that are members of the rail family Rallidae. They constitute the genus Fulica. Coots have predominantly black plumage, and, unlike many of the rails, they are usually easy to see, often swimming in open water...

, gulls and tern

Tern

Terns are seabirds in the family Sternidae, previously considered a subfamily of the gull family Laridae . They form a lineage with the gulls and skimmers which in turn is related to skuas and auks...

.

Most of the lagoon was designated a bird sanctuary in 1938.