Teaching English is a great way to experience life in a foreign culture. Asia is a popular choice for those starting out in the ESL/EFL field because there are plenty of jobs available and the pay can be quite good, allowing a person to actually save money while having fun and travelling.

In large Asian countries which have experienced recent periods of rapid economic growth, such as Japan, South Korea, Taiwan, Thailand and China, the demand for English teachers is so high that an undergaduate degree of some sort is usually the sole requirement for landing a job.

It certainly also helps to be from a country known to produce "native speakers of English." These countries are generally considered to be, the United Kingdom, the United States, Canada, Australia, New Zealand, South Africa, and Ireland. This dubious generalization causes many fluent Anglophones much grief, and it's not certainly not proven that having an accent or (horrors) not being a "native speaker" is much of a hindrance to teaching English effectively.