Zonggu is a valley between two mountain ranges, and walktoward of mountain range and river flowing forward is Parallel. Opposite just Henggu River walktoward and mountain range performed "water accurity", just as a mountain-a river-a mountain arrange, whatever is southnorth toward (Straight), or east-west toward (Across), even northeast-southwest�northwest-southeast(Slope), only want river parallel to the mountain range, justs Zonggu
A good example is in eastern Taiwan where located between Central Mountain Range and Eastern Coast Mountain Range river valley, some major river is , , and etc.Hua-dong Zonggu, its two side Mountain Ranges(Central, Coast)and between mountain range Hualien Creek and Beinan Creek is parallel, causing composed Zonggu terrain.
In additial western Yunnan "" is composed by mountain ranges such:Gaoligong, Nushan, Ailao and Wuliang, it has been paralleled rivers such Jinsajiang, Lancangjiang, Nujiang, , Enmeikaijiang, and Panjiang etc.
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