The definition of "Asian" may be inclusive and broad, and applies to people who come from or whose ancestors come from: East Asia - China, Hong Kong S.A.R., Japan, Mongolia, North Korea, South Korea, Taiwan.
South Asia - Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan, Sri Lanka.
Central Asia - Afghanistan, Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, Uzbekistan.
Southeast Asia - Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, Philippines, Singapore, Thailand, Vietnam
(from http://www.asianheritagemonth.org/ )