Colombo is the largest city and commercial capital of Sri Lanka. It is located on the west coast of the island and adjacent to Sri JayawardenapuraKotte, the capital. Colombo is a busy and vibrant city with a mixture of modern life and colonial buildings and ruins and a city 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 kmē. 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 JayawardenapuraKotte.