It was all over the place in Chongqing, but then I entered a Bei Bing Yang desert and was without for weeks. I'm now in Xingyi and I've finally found it again. Very refreshing, fizzy orange drink with orange bits in. Lovely.
Bingfeng and Beibingyang taste like cheap orange soda, which is a comfortable childhood taste. i always get Bingfeng at Xi'an noodle shops across the country if available, or Hansi pineapple if not.
my favourite regional soda is Asia brand sarsaparilla from Guangzhou. embrace regional old brand tradition, reject multinational corporate soda modernity 
edit, my spelling was all over the palce