Bashidang (simplified Chinese: 八十垱; traditional Chinese: 八十壋; pinyin: Bāshídàng) was the site of a Neolithic Yangtze River settlement in Lixian County, Hunan, China. Bashidang is considered to be a very late site of the Pengtoushan culture. The site is the earliest in China to feature both a wall and a ditch; the ditch was the outermost perimeter. A raised, star-shaped platform was found at the center of the settlement, possibly used for ceremonial purposes. So far, Bashidang is the only site in southern China from the Neolithic to the Bronze Age to yield evidence of soybean seeds.