I have occasionally said to people to people that I’ve taught students from more than 30 countries. I think the list below is accurate, but I might have missed one or two. Overwhelmingly most of my students have been/are from Asian countries (esp PR China, Hong Kong, RO China, Thailand) at my current college, South American countries (esp Colombia, Peru, Brazil) at my previous college, and South Korea in South Korea. I’ve had only one or two students from most of the African, Middle-Eastern and European countries.
Mongolia PR China Hong Kong RO China South Korea Japan
Thailand Cambodia Vietnam Malaysia Singapore Indonesia Fiji
Mexico Colombia Peru Brazil Argentina
Tanzania Kenya Egypt UAE Jordan Israel Lebanon Turkey
Spain Italy Hungary Czech Republic Poland Latvia Lithuania Greece
Iran Pakistan India Nepal Bangladesh