What river valley civilization was most isolated from invasion and contact with other civilizations

China was the most isolated of the River Valleys because of mountains & deserts, which made up 2/3 of China's land, and also because of water to the east. Writing that became a beautiful art form during the Shang Dynasty in China.

Explanation:

China was the most isolated of the River Valleys because of mountains & deserts, which made up 2/3 of China's land, and also because of water to the east. Writing that became a beautiful art form during the Shang Dynasty in China.

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