This recently established botanical garden is the biggest botanical gardens in Sri Lanka and covers and extent of approximately 300 acres. Work on several parts of the garden still remains to be completed.  Yet it is a great source of entertainment and information for both the casual visitor and serious student on dry zone vegetation, birds and butterflies

Mirijjawila Botanical Garden is one of the five botanical gardens in Sri Lanka. The other botanical gardens are Peradeniya Botanical Garden, Hakgala Botanical Garden, Henarathgoda Botanical Garden and Seetawaka Botanical Garden.

Mirijjawila Botanical Garden is located on the Colombo-Kataragama main road. It has the Mattala International Airport on its left side and the Hambantota Harbour on its right side.

This land was covered with thorny shrubs and abandoned chena lands, when it allocated for this purpose in 2006. Three water tanks named Kohombagas wewa, Malitthangas wewa and demataththa wewa, are constructed in the garden premises to preserve the moisture of the land.