|Location||Trincomalee District, Sri Lanka|
|Primary inflows||Verugal Aru|
|Primary outflows||Indian Ocean|
|Max. length||7 kilometres (4.3 mi)|
|Max. width||2 kilometres (1.2 mi)|
|Surface area||13 square kilometres (5.0 sq mi)|
|Max. depth||2 metres (6.6 ft)|
|Surface elevation||Sea level|
Ullackalie Lagoon (Tamil : உல்லைக்கழி Ullaikkaḻi) is a lagoon in Trincomalee District, eastern Sri Lanka.
The lagoon is fed by a number of small rivers including Verugal Aru and Uppu Aru. It is linked to the sea by a narrow channel to the south. The lagoon's water is brackish.
The lagoon is surrounded by evergreen forest and scrubland. The land is used for subsistence fishing.
The lagoon has extensive mangroves. The lagoon attracts a wide variety of water birds including ducks and other shorebirds.
The western part of the lagoon was designated an animal sanctuary in 1970.
The Sri Lankan Civil War was a civil war fought in Sri Lanka from 1983 to 2009. Beginning on 23 July 1983, there was an intermittent insurgency against the government by the Velupillai Prabhakaran led Liberation Tigers of Tamil Eelam. The LTTE fought to create an independent Tamil state called Tamil Eelam in the north-east of the island, due to the continuous discrimination and violent persecution against Sri Lankan Tamils by the Sinhalese dominated Sri Lankan Government.
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The Eastern Province is one of the nine provinces of Sri Lanka, the first level administrative division of the country. The provinces have existed since the 19th century but did not have any legal status until 1987 when the 13th Amendment to the Constitution of Sri Lanka established provincial councils. Between 1988 and 2006 the province was temporarily merged with the Northern Province to form the North Eastern Province. The capital of the province is Trincomalee.
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