The People's Republic of China (Mainland China) have 56 recognized indigenous ethnic groups are Zhuang (16.1 million), Manchu (10.6 million), Hui (9.8 million), Miao (8.9 million), Uyghur (8.3 million), Tujia (8 million), Yi (7.7 million), Mongol (5.8 million), Tibetan (5.4 million), Buyei (2.9 million), Dong (2.9 million), Yao (2.6 million), Korean (1.9 million), Bai (1.8 million), Hani (1.4 million), Kazakh (1.2 million), Li (1.2 million), and Dai (1.1 million).
I must say that the ethnic minorities living in the extreme northern regions of China, such as the Buryat, Daur, and Ewenki, are Buddhists, and are closely related to the indigenous peoples of Siberia - they speak the Altaic languages.
Those in Xinjiang are the Uyghurs, Kazak, Tajik, Tujia, and others. They speak Turkic languages and practice Islam.
Those in Ningxia are the Hui peoples, coming from a mixture of Han Chinese and Arab and Persian Islamic missionaries and traders. They practice both Han Chinese and Islamic traditions, but speak Mandarin.
Those in Xizang are the Tibetans, as well as other ethnic minorities suh as the Sherpa. They speak the Tibeto-Burman languages and are Buddhists.
Those living in the southwest regions of China, such as the Yi, Bai, Hani, Tai, Dai, Miao, Lisu, Hui, Lahu, Va, Nakhi, Yao, Jingpo, Blang, Pumi, Nu, Achang, Jinuo, Derung, Shui, and Buyei, are all closely related to the mountain tribes of Southeast Asia - especially to the Hmong, Lao, and Thai peoples.
The province of Hainan has substantial portions of ethnic minorities such as the Li and the Ong-Be, both speak Kradai languages and are closely related to Southeast Asians. There are also Li tribes living in the Philippines.
According to tradition, there are also Haitan people scattered across Southern China - these were Negritos used as slaves by the Han Chinese. Legend says that they were forced to migrate southward by invasions of the Mongol army. There are also Haitan people living in Malaysia, Andaman Islands, and the Philippines.
The Republic of China (Taiwan) in turn, have 9 indigenous groups, all of which are genetically affiliated with the Filipinos. These are the Ami, Atayal, Paiwan, Bunun, Puyuma, Tsou, Rukai, Saisiyat, and Yami. All of their languages are very similar to the Filipino language, and many of them are either Christians or Buddhists.