"The names of these historic mountains were Youle (copper gong), Mangzhi (copper boa), Manzhuan (iron brick), Yi Bang (wooden clapper), Gedeng (leather stirrup), and Mansa (seed-sowing bag).
We do know that of the mountains considered to be the famous Six by the mid-twentieth century, many had fallen into extreme disrepair due to large fires, over-picking, or neglect. As a result, in 1962 a new group of Famous Six Tea Mountains were named based on the best tea producing mountains at the time - Yiwu, Jingmai, Menghai, Nannuo, Bulang, and Youle. All of these mountains had been famous for many years, one of which, Youle, was a member of the original Six.
Throughout the years, another Famous Six were designated from Jiang Nan (south of the Mekong River) and include some of the mountains from the 1962 list. These are Mengsong, Nannuo, Menghai, Bada, Nanqiao, and Jingmai."
According to JingTea's description:
"The tea that is harvested from the Yi Wu Mountain is always considered as the best quality in Yunnan. There are only a small number of productions made of the real Yi Wu tea each year due to its very limited producing area."
Youle Mountain is the largest I've read which makes me mad about my first bad purchase from 7 cups. Bah.