Thalawathugoda Biodiversity Study Park (now known as the Diyasaru Park) is a wetland artificially built near the new Parliament Complex in Sri Jayawardanapura in a marshland. Diyasaru Park covers approximately 60 acres with artificial ponds and canals where you could see over 50 varieties of migratory birds, over 15 fish varieties including three endemic to Sri Lanka, and over 25 butterfly species