“avoid peak and fill up valley” measures
1998 summer heavy precipitation in the Yangtze and Huaihe River valley
3-order nonsingle-valley Feigenbaum’s map
6 cities of the Yangtze River Valley
Alluvial valley containing multiple circular-arc l
alpine river valley in Tibet
ancient Yangtze River valley
Ancient Yellow River Valley
arid hot valley land of Yuanmou