Diyasaru Park, formerly known as Biodiversity Study Park, Thalawathugoda, is a 60-acre urban

wetland park in Sri Jayewardenepura Kotte, Sri Lanka. The park was originally a paddy field, but

was converted into a wetland after dredged material from the construction of Parliament Lake

was deposited on the land in the late 1970s.

During the flood in 2010, the government initiated a project to reconstruct and modify the area as

a wetland. The land was divided into several small islands and artificial canals were made. The

park premises now serve as a flood detention area by absorbing flood water during heavy storms

and reducing inundation of the parliament area.

The park was named Diyasaru, which means “Rich in water” in Sinhala, to reflect its unique

ecosystem. The park is home to a wide variety of plants and animals, including many endangered

and endemic species. It is also a popular spot for birdwatching, with over 50 species of migratory

birds recorded in the park