Batticaloa (, Maṭṭakkaḷappu; , Maḍakalapuwa) is a major city in the Eastern Province, Sri Lanka, and its former capital. It is the administrative capital of the Batticaloa District. The city is the seat of the Eastern University of Sri Lanka and is a major commercial centre. It is on the east coast, south of Trincomalee, and is situated on an island. Pasikudah is a popular tourist destination situated northwest with beaches and flat year-round warm-water shallow-lagoons. Etymology Batticaloa is a Portuguese derivation. The original name of the region being the Tamil "Matakkalappu" (translation: Muddy Swamp). According to Mattakallappu Manmiyam (மட்டக்களப்பு மான்மியம்) the word Mattakkallpu consists Tamil words "Mattu" (மட்டு) Matta-derived from "Mattam" (மட்டம்) means 'flat' and geographical name KaLappu. Mukkuwa named this place as KaLappu-Mattam or boundary of lagoon later it became Matta-Kallappu or Flat Lagoon. Also, Batticaloa has a nickname, "Land of the singing fish" () due to musical sounds that related to fish or aquatic creature in the Batticaloa Lagoon near the Kallady Bridge. BBC Radio 4 was able to record the mysterious sound in Batticaloa Lagoon. The sound was broadcast by Sri Lanka Broadcasting Corporation in 1960s with the help of Rev. Fr. Lang, a Catholic priest. Geography Batticaloa is in the eastern coast of Sri Lanka on a flat coastal plain boarded by the Indian Ocean in the east occupies a central part of the eastern Sri Lanka. Its average elevation is around . Batticaloa district has three lagoons such as Batticaloa Lagoon, Valaichchenai Lagoon, and Vakari (Panichchankerni) Lagoon. Among these lagoons, Batticaloa Lagoon is the largest lagoon, which is long and has an area of , extending from Pankudaweli in North and Kalmunai in South. There are several islands within the Batticaloa Lagoon such as Puliayantheevu, Buffaloa Island and Bone Island. Many bridges are built across the lagoon connecting the landmasses and the islands. The Puliayantheevu is the metropolitan place of the city. The biggest bridge of all is Lady Manning bridge located at Kallady, which is the main access path to the city from the southern places of the district. This bridge is also famous for Singing fishes which were considered as musical sounds heard in the Kallady lagoon on a full moon day. A priest named Father Lang recorded this musical charm and broadcast it in the 1960s over the (Sri Lanka Broadcasting Cooperation) Batticaloa beaches are sandy and located along shoreline in