Asia has some of the major world destinations when it comes to TEFL teaching.
China is the new big player in this field and thousands of English teachers work there from all the English speaking countries (as well as a notable number of non-native speakers as well from other countries). With a longer history of welcoming English teachers, the other big players in this region are South Korea, Japan and Vietnam. But do not dismiss the other countries in this region where English teaching is well established.
The following is a list of countries in Asia with detailed information on working there.