Answer:
The Southeast without a doubt. That is to say, Southesat Asia.
Explanation:
China has strong geographic boundaries on four directions: the Gobi Desert to the North, the Tibet and the Himalayas to the East and the Southwest, and the Ocean to the West. However, to the Southeast, smaller mountains and jungles, while did represent a barrier, was easier to trespass than other regions.
This is why the Chinese civilization, from early on, had very close contact with Southeast Asia, and became colonizers of the region. Vietnam for example, was at a point in history a Chinese colony and a large percentage of the Vietnamese population is of Chinese origin.
