Colombo is the largest city of Sri Lanka. It is located on the west coast of the island and adjacent to Sri Jayawardenapura Kotte, the capital of Sri Lanka. Colombo is often referred to as the capital of the country, since Sri Jayawardenapura Kotte is a satellite city of Colombo. Colombo is a busy and vibrant city with a mixture of modern life and colonial buildings and ruins and a population of 647,100. The Colombo Metropolitan Region, defined by the districts of Colombo, Gampaha and Kalutara, has an estimated population of 5,648,000, and covers an area of 3,694.20 km². As per the Provincial Gross Domestic Product-2010, The Western Province, which includes the cities of Colombo, Gampaha and Kalutara recorded GDP per capita of USD 3,808, the highest recorded GDP per capita for any region in South Asia. It was formerly the political capital of Sri Lanka, before Sri Jayawardenapura Kotte.
Due to its large harbour and its strategic position along the East-West sea trade routes, Colombo was known to ancient traders 2,000 years ago. It was 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 Jayawardenepura 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 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.
Etymology
The name "Colombo", first introduced by the Portuguese in 1505, is believed to be derived from the classical Sinhalese name කොලොන් තොට Kolon thota, meaning "port on the river Kelani". It has also been suggested that the name may be derived from the Sinhalese name කොල-අම්බ-තොට Kola-amba-thota which means "Harbour with leafy mango trees". However, it is also possible that the Portuguese named the city after Christopher Columbus, the Italian sailor who lived in Portugal for many years before discovering the Americas on behalf of the Spanish monarchs Ferdinand II of Aragon and Isabella I of Castile. His Portuguese name is Cristóvão Colombo. Colombo set sail westwards to look for India around the same time Portuguese sailor Vasco da Gama set sail eastwards, landing at the Port of Calicut in India on 20 May 1498. Colombus landed in the Americas six years before that on 12 October 1492 and was already a famed sailor and explorer, celebrated both in Portugal and Spain by the time Dom Lourenço de Almeida accidentally landed in the port of Galle in 1505.
Geography and climate
Colombo's geography is a mix of land and water. The city has many canals and, in the heart of the city, the 65-hectare (160-acre) Beira Lake. The lake is one of the most distinctive landmarks of Colombo, and was used for centuries by colonists to defend the city. It remains a popular attraction, hosting regattas, and theatrical events on its shores. The Northern and North-Eastern border of the city of Colombo is formed by the Kelani River, which meets the sea in a part of the city known as the Modera (mōdara in Sinhala) which means river delta.
Colombo features a tropical rainforest climate under the Köppen climate classification. Colombo's climate is fairly temperate all throughout the year. From March to April the temperature averages around 31 degrees Celsius (88 degrees Fahrenheit) maximum. The only major change in the Colombo weather occurs during the monsoon seasons from May to August and October to January. This is the time of year where heavy rains can be expected. Colombo sees little relative diurnal range of temperature, although this is more marked in the drier winter months, where minimum temperatures average 22 degrees Celsius (72 degrees Fahrenheit). Rainfall in the city averages around 2,400 millimetres (94 in) a year.
Demographics
Colombo is a multi-ethnic, multi-cultural city. The population of Colombo is a mix of numerous ethnic groups, mainly Sinhalese, Moors and Tamils. There are also small communities of people with Chinese, Portuguese, Dutch, Malay and Indian origins living in the city, as well as numerous European expatriates. Colombo is the most populous city in Sri Lanka, with 642,163 people living within the city limits. In 1866 the city had a population of around 80,000. According to the census of 2001 the demographics of urban Colombo by ethnicity is as follows.

National capital
Colombo was the capital of the coastal areas controlled by the Portuguese, Dutch and the British from the 1700s to the 1815 when the British gained control of the entire island following the Kandian convention. From then until the 1980s the national capital of the island was Colombo. During the 1980s plans were made to move the administrative capital to Sri Jayawardenepura Kotte and thus move all governmental institutions out of Colombo to make way for commercial activities. As a primary step the Parliament was moved to a new complex in Kotte and several ministries and departments were also moved. However the move was never completed. Today many governmental institutions still remain in Colombo. These include the President's House, Presidential Secretariat, Prime Minister's House (Temple Trees), Prime Minister's Office, the Supreme Court of Sri Lanka, Central Bank of Sri Lanka, important government ministries and departments; such as Finance (Treasury), Defence, Public Administration & Home affairs, Foreign affairs, Justice and the Military headquarters, Naval headquarters (SLNS Parakrama), Air Force headquarters (SLAF Colombo) and Police national and field force headquarters.