The region consists of the former Soviet republics of Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan.

Indochina can be considered as the mainland of Southeast Asia, and there are 6 countries in Indochina including Cambodia, Laos, Malaysia, Myanmar, Thailand and Vietnam.

The term "Middle East" originated from the same European perspective that described Eastern Asia as "the Far East." 

Modern definitions of South Asia are consistent in including Afghanistan, India, Pakistan, Bangladesh, Sri Lanka, Nepal, Bhutan and Maldives as the constituent countries.

Southeast Asia is a subregion of Asia, consisting of the regions that are geographically south of China, east of the Indian subcontinent and north-west of Australia.