Yoda Ela (Giant Canal) or Jaya Ganga, an 87 km (54 mi) long single banking water canal carrying excess water to Tissa Wewa reservoir from Kala Wewa reservoir in Anuradhapura.

[1][2][3] Yodha Ela was constructed during King Dhatusena's reign in 459 AD.

Even with modern day survey equipment it would be difficult to achieve such accuracy.

A separate branch of the canal has then already brought water to the Nachchaduwa wewa.

It feeds water in an area of 470 km2 (180 sq mi) feeding 4,630 ha (11,400 acres) of paddy lands and 120 small tanks on its way from Kala Wewa to Tissa Wewa[7]