why doesn't the great wall encircle all of china?

Question

As in, sure, it stops some invasions, but why not on all the other sides of China?

Kathy · Answer

In ancient China, the ruler demanded to build the great wall is mainly to defend the invasion of nomads such as Hunnu from the north.

Karina · Answer

so that the people of china can be safe by the wall.

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Why doesn't the great wall encircle all of China?