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Formosa oolong tea is from Taiwan. Oolong teas are made from the same plant as black and green teas, but the difference lies in how the leaves and stems are processed. Green tea is unfermented, black is fully fermented, and oolong lies in between the two, being partially fermented. Taiwanese oolongs tend to be fruitier and darker than other oolong teas, which is due to environmental differences. Tea plants in Taiwan are grown on mountains at high elevations, which is believed to account for the tea's unique flavor.