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I want to know about China's visit to neighboring countries in the late Ming Dynasty.

There are more than 40 vassal States: Xinjiang, Tibet and Mongolia have actually become the territory of China, but they still belong to the status of vassal States in name.

Houjin, that is, most of today's three northeastern provinces and parts of eastern Russia.

North Korea, the sum of North Korea and South Korea today.

Japan, roughly the present territory, has no northern islands and Ryukyu Islands.

Annan, Vietnam today

Luzon Island in the Philippines today.

Ryukyu, today's Okinawa Prefecture, Japan.

Laos, Laos today.

Siam, Thailand today.

Myanmar, today's Myanmar

India, parts of India today, Bangladesh and Pakistan.

Nibala, Nepal and Bhutan today.

Java, Indonesia today

Ceylon, Sri Lanka today

Malacca, Malaysia today

There are also groups called tribes or countries on the grasslands of Central Asia and Mongolia.