Seethawaka Wet zone Botanic Gardens is the 5th Botanic Garden of the Department of National Botanic Gardens and the first botanic garden established solely for the conservation of wet zone flora in Sri Lanka. Development of the garden was initiated in 2008 and opened to the general public in 2015. It is situated on the Puwakpitiya-Thummodara road, at Illukowita, adjacent to the IndikadaMukalana Forest Reserve at Avissawella which is a suburban area of the Colombo district.