There's a dig going on in
Jianchuan, Yunnan, China right now -
http://www.chinadaily.com.cn/china/2008-07/22/content_686517... /
http://www.kaogu.cn/en/backup_new/new/2013/1026/42529.html /
http://www.kaogu.cn/en/Special_Events/Archaeology_Forum_2008... /
http://en.cnki.com.cn/Article_en/CJFDTotal-KAGU200908003.htm - that is apparently the first place they've found with stilted houses (now found right across the tropics of Southeast Asia, first documented in Han Dynasty tomb carvings of the neighboring Sichuan region), rivalled only by a site in Switzerland in terms of scale at this vintage.
The location is in a natural depression above the first major bend in the upper Yangtze river, an ancient corridor for trade and ideas between central China, Tibet and South Asia. It was no doubt an artery through which the first knowledge of rice cultivation spread, given that there are still debates about where it began but they are essentially between or in proximity to river valleys that converge at this point (Yangtze, Brahmaputra, Red River, Salween, Mekong). Ancient history is truly fascinating!
Also I am translating a 1000 year old text from the region, 2 days ago it was talking about dyeing silk thread indigo/vermillion: https://en.wikisource.org/wiki/Translation:Manshu/Chapter_7#...