Datong () is a prefecture-level city in northern Shanxi province, People's Republic of China, located in a basin at an elevation of 1040 m and bordering Inner Mongolia to the north and west and Hebei to the east. It had a population of 3,318,057 at the 2010 census of whom 1,629,035 lived in the built up area made of 3 out of 4 urban districts, namely Chengqu, Kuangqu and Nanjiao District.
The name "Mongolia" has four syllables.
It's correct because the name is pronounced with four syllables. Maybe the AI isn't trained in pronunciation? 