Such was the swift flow of immense volume of waters for irrigation channeled from the magnificent Kala Wewa-Balalu Weva twin reservoir located 40km south south-east of Sri Lanka Holidays Anuradhapura, it served as a major source of distribution to the larger portion of Nuwarakalaviya [the region of three great reservoirs: Nuwara Wewa irrigation reservoir, Kala Wewa irrigation reservoir and Padaviya Wewa irrigation reservoir] which covered a region [River Kala-oya to the south-west and River Malwatu-oya to the north] of few rivers, yet none of which could be considered perennial, by way of a 87km long man-made canal called Yoda Ela [Sinhala: Giant Canal] or Jayaganga [Jaya Ganga: Sinhala -River of Victory] as narrated by Mahavamsa, the great chronicle of Sri Lanka.