Table 3 Defensive space efficiency calculation basis table

From: A quantitative evaluation model of ancient military defense efficiency based on spatial strength—take Zhejiang of the Ming Dynasty as an example

Defense area of "four Canjiang and six Bazong"

Length of coastline /km

Land area /km2

Hang-Jia-Hu

254.163

5220.096

Ning-Shao

2778.319

13,325.993

Tai-Jin-Yan

1195.738

5720.633

Wen-Chu

852.149

6055.128

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