Sanaa and Zhangjiakou
Comparison by area and population

Sanaa

Yemen

Zhangjiakou

China

Population

2 575 347
(2012)

2 575 347
(2012)

4 345 491
(2010)
4 345 491
(2010)

Area

126 km2

126 km2

36 947 km2
36 947 km2

Population density

20 439.30
/km2

20 439.30/km2

117.61/km2
117.61
/km2
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