from Wikipedia Colombo:
Colombo (Sinhala: , pronounced [ˈkoləmbə]; Tamil: கொழும்பு) is the largest city and commercial capital of Sri Lanka. Located on the west coast of the island and adjacent to Sri Jayawardenepura Kotte, the administrative capital of Sri Lanka, Colombo is a busy and vibrant city with a mixture of modern life and colonial buildings and ruins and a city population of over 600,000.
The name "Colombo", first introduced by the Portuguese in 1505, is believed to be derived from the classical Sinhalese name Kolon thota, meaning "port on the river Kelani". It has also been suggested that the name may be derived from the Sinhalese name Kola-amba-thota which means "Harbor with leafy mango trees".
Due to its large natural harbour and its strategic position along the East-West sea trade routes, Colombo was known to ancient traders 2,000 years ago. However it was only made the capital of the island when Sri Lanka was ceded to the British Empire in 1815, and its status as capital was retained when the nation became independent in 1948. In 1978, when administrative functions were moved to Sri Jayawardhanapura Kotte, Colombo was designated as the commercial capital of Sri Lanka.
Like many cities, Colombo's urban area extends well beyond the boundaries of a single local authority, encompassing other Municipal and Urban Councils. The main city is home to a majority of the Sri Lanka's corporate offices, restaurants and entertainment venues. Famous landmarks in Colombo include the Galle Face Green, the Viharamahadevi Park as well as the National Museum.