Gampaha Botanical Garden also known as Henarathgoda Botanical Garden is situated in the suburb of Gampaha, about 18 miles (29 km) north-west of Colombo and within 1 kilometre (1,100 yd) from the Gampaha Railway Station, and not more than 500 yards (460 m) from the Gampaha-Minuwangoda road.
It was established in 1876 by the British to conduct experiments on exotic economic plants such as Rubber and explore plant wealth and development of economy in the Colony. The altitude of garden is about 33 feet above the sea level. It has a tropical low-country climate. The total area of the botanical garden is about 36 acres and recently it acquired another 7 acres for its expansion process
The total area of the garden is about 33 acres and it is more than 140 years old. The garden is divided into two segments- the orchid garden and the Japanese garden. Visitors can see an extensive variety of plants, shrubs, trees and bushes that are endemic to the country. In addition, the garden is also home to more than 80 species of birds, 12 species of butterflies and 18 species of mammals. Tourists can also take a boat ride at the Attanagalu Oya. The local and foreign people come to every day this place to watch them.