claim: Agent Raghav – Crime Branch is a serial.
evidence: Sorabora Wewa -LRB- Sinhalese  : ස රබ ර ව ව -RRB- is an ancient reservoir in Mahiyangana , Badulla District Sri Lanka .. Mahiyangana. Mahiyangana. Sinhalese. Sinhalese language. Badulla District. Badulla District. Sri Lanka. Sri Lanka. It is thought to have been constructed during the reign of King Dutugemunu -LRB- 161 BC -- 137 BC -RRB- by a giant named Bulatha .. King Dutugemunu. Dutugamunu. In the ancient past , this tank was known as the ` Sea of Bintenna ' .. The tank has been built by damming the Diyawanna Oya with a 485-meter embankment .. Diyawanna Oya. Diyawanna Oya. It does not make use of the structure called Bisokotuwa , which helps to regulate water pressure at the sluice gates from inside the tank and protect the embankment from erosion .. Instead that the sluice gate -LRB- Sorowwa -RRB- of the tank has been placed strategically away from the embankment and made up utilizing the massive natural rock around the tank .. It is say that this is the only such type sluice gate found in Sri Lanka .. Sri Lanka. Sri Lanka