Wiktionary:About Wutunhua
Wutunhua is an isolated variety of Mandarin Chinese which has been heavily influenced by Amdo Tibetan, and to a lesser extent by the Mongolic language Bonan. It is not intelligible with other Mandarin dialects, and is spoken by around four thousand people in three villages in Tongren, Qinghai, China. Virtually all speakers are bilingual in the local variety of Amdo, and the community considers itself (and has recently been reclassified by the government as) ethnically Tibetan, their mother tongue notwithstanding. The villagers are Tibetan Buddhists and are famous for their thangka paintings.