The geography of china
Aleft it open to invaders.
Ckept it isolated.
Bmade farming difficult.
Dencouraged sea and river trading.the geography of china
Ckept it isolated.
Aleft it open to invaders.
Ckept it isolated.
Bmade farming difficult.
Dencouraged sea and river trading.the geography of china
Ckept it isolated.