Most commonly produced in China and Taiwan, Oolong is a semi-oxidized tea that's unique due to its processing. Wulong means "black dragon" because Oolong tea is in theory twisted and curled into a shape resembling a Chinese dragon. It can be oxidized light, medium, or high and can fall anywhere between green and black, typically ranging from 20-85%, giving it a very extensive variety of flavor profiles. While Oolong varieties are often produced differently, they can be rolled, twisted, or curled into balls even.