Gampaha is an urban city in Gampaha District, Western Province, Sri Lanka. It is situated to the north-east of the capital Colombo. It is the sixth largest urban area in Western Province, after Colombo, Negombo, Kalutara, Panadura and Avissawella.
Gampaha Botanical Garden, also known as Henarathgoda Botanical Garden is situated in the suburb of Gampaha. 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 first imported rubber tree to Sri Lanka was first planted in this garden and it was the first seedlings of Brazilian rubber tree ever planted in Asia. The garden consists of a large variety of plants and many of them are from every corner of the tropical world it is expanding over 43 acres and situated next to the Attanagalu Oya and surrounded by paddy fields, a man-made green environment and a secondary forest as well laid out with lots of interesting sections, eye-catching landscaping and many shrubs, bushes and trees.