Dark tea, also known as “Hei Cha” in China, is a category of fermented tea that is produced in several provinces of China, including Hunan, Sichuan, and Yunnan. Dark tea undergoes a unique fermentation process that gives it a distinct earthy and sometimes smoky flavor. Some examples of Chinese dark tea include Pu-erh tea, a tea made from the leaves of the Camellia sinensis plant that is fermented and aged for several years, and Liu Bao tea, a tea that is aged in bamboo baskets and has a smooth and mellow flavor. Other popular varieties of Chinese dark tea include Fu Brick tea, a tea that is compressed into bricks and has a rich and earthy flavor, and Tibetan tea, a tea that is made from fermented yak milk and has a unique and tangy taste.