Located 5 kilometers southwest of the city of Kandy, it is the largest botanical garden in Sri Lanka and the second largest botanical garden in Asia (ranked second only to Bogor Botanical Garden in Indonesia). The earliest history of Peradeniya Botanical Gardens dates back to the feudal dynasty of Sri Lanka in 1371. It was once the royal garden of the Kandy king. The foundation of Peradeniya Garden was created in 1821 and was officially completed in 1843, covering an area of 60 hectares. The east, west and north sides of Peradeniya Botanical Gardens are surrounded by the Mahaweli River, with beautiful landscapes. It is one of the best tropical botanical gardens in the world. Today, more than 4,000 types of plants native to Sri Lanka are planted and collected in the park, as well as plants brought from other countries, some of which are very rare and precious tropical plants. The seasons are like spring, the plants are lush and flowers bloom everywhere.The terrain at Peradeniya Botanical Gardens is undulating, with an average elevation of over 460 metres. The annual rain supply of more than 200 days makes various exotic tropical grasses at Peradeniya Botanical Gardens grow vigorously all year round. Thousands of tropical and subtropical plants from all over the world are grown here. There is a tree called upas tree, which is strictly protected, it is said to emit poisonous gases and can cause death. In ancient times, people used to use its juices to make poisonous arrows, etc. Peradeniya Botanical Garden has such a large number of plant varieties that they can provide scientific and technological information for biological engineering, ecology, etc.