Derong wrinkled mandarin orange is a specialty of Derong County, Ganzi Prefecture, Sichuan Province. Wrinkled tangerine, also known as Tibetan tangerine, has golden skin, tender flesh, juicy juice and moderate sour and sweet taste. It is deeply loved by Tibetan people. Nowadays, huanggan (Wrinkled pigan) is still in its original cultivation state and only distributes in the middle and lower reaches of the Sanjiang River in the southern section of hengduan Mountains.