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The Kelani River (කැළණි ගඟ) is a 145-kilometer-long (90 mi) river in Sri Lanka. It ranks as the fourth-longest and one of the main rivers in the country, originated from the Sri Pada Mountain Range to Colombo. Along its course, it passes through or borders several Sri Lankan districts, including Nuwara Eliya, Ratnapura, Kegalle, Gampaha, and Colombo itself. The Kelani River has two main tributaries in its upper reaches: the Kehelgamu Oya and the Maskeli Oya. These tributaries contribute to hydroelectric production in Sri Lanka, with major reservoirs and power stations along their course. Notable reservoirs include Castlereigh Reservoir, Norton Reservoir, Maskeliya Reservoir, Canyon Reservoir, and Laxapana Reservoir. The Kelani River supplies approximately 80% of the water used in Colombo, making it crucial for the capital city. Beyond drinking water, the river serves transportation, fisheries, and hydroelectricity production.
Ruhunukanda Forest Reserve is located in the Kalutara district and has a high level of biodiversity. This Ruhunukanda forest is adjacent to the Singhraja forest and is a popular destination for local and foreign tourists and researchers. The forest is home to a variety of birds, reptiles, insect species, toad species, mammals and very rare species of butterflies. The Maguru River flows through the forest of the Ruhunu Hills, adding to its appeal. This is called an evergreen rain forest. Ruhunukanda forest is home to 52 different bird species. The period from December to March has been identified as the best time to visit the Ruhunu Kanda ecosystem. The reason is the decrease in rainfall during that period.
Gampaha District happens to be one of the key places in the country to have rich fertile soil that enable to grow any fruit or a vegetable including paddy
