Ceylon tea, grown in Sri Lanka, is often regarded as among the best in the world. The most widely produced and exported variety of tea from Sri Lanka is black tea, hence the popular usage of the name "Ceylon tea" to refer to black tea. Green tea, white tea, and oolong tea are also produced in the country. Ceylon tea, like all other forms of tea, is brewed from the leaves of the Camellia sinensis plant. Variations in growing conditions, altitude of the tea gardens, and processing techniques all contribute to the unique flavor profiles of Ceylon tea.