Colombo (pronounced [ˈkoləmbə]; Tamil: கொழும்பு) 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.