Varietal 105 is grown in the "Zheng Yan" area of Wu Yi. Zheng Yan (正岩) refers to the innermost protected area of the Wu Yi Heritage site. It's a protected area separate from the scenic area and outsiders are not allowed inside. The "Zheng Yan Growing Area" refers to these tea gardens: tiānxīn yán/天心岩, mǎ tóu yán/马头岩, huìyuàn/慧苑, zhú kē/竹窠, bì shí/碧石, yànzi kē/燕子窠, jiǔlóng kē/九龙窠, yù cháyuán/御茶园, yù huā dòng/玉花洞, shuǐ lián dòng/水帘洞, fo guó/佛国, táohuā dòng/桃花洞, guìlín/桂林, sān yǎng fēng děng děng/三仰峰等等.
Varietal 105 is a unique Anxi varietal that's a hybrid of Huang Jin Gui and Jin Guan Yin (Jin Guang Yin itself is a cross between Huang Jing Gui and Tie Guan Yin). As such, 105 could be considered 3 parts Huang Jin Gui and 1 part Tie Guan Yin. Due to the unique soil and growing conditions within the Zheng Yan growing area, and the unique Wu Yi processing, the resulting 105 tea is very much a Wu Yi tea despite it's unique Anxi origins. It should be noted that varietal 105 was created by a Wu Yi local and is entirely unique to the Wu Yi Shan area.