Asia is Earth's biggest and most populated continent, found mainly in the Eastern and Northern Hemispheres. It cohabits Eurasia with the continent of Europe and the continental landmass of Afro-Eurasia with both Europe and Africa.
Asia is subdivided into 49 countries, three of them (Russia, Kazakhstan and Turkey) elements of their land in Europe. Asia has extremely diverse climates and geographic features. Climates range from arctic and subarctic in Siberia, to tropical in southern India and Southeast Asia.
The enormous continent of Asia can be divided into five geographical subregions: Central Asia, East Asia, South Asia, Southeast Asia, and Western Asia. South Asia is the most densely populated area in the world; Central Asia, which includes Tajikistan, Uzbekistan, Kazakhstan, Turkmenistan and Kyrgyzstan; East Asia, which includes China, Mongolia, North Korea, South Korea, Japan, Hong Kong, Taiwan and Macau; South Asia, which includes Sri Lanka, Bangladesh, India, Afghanistan, Pakistan, Bhutan, Nepal and the Maldives; Southeast Asia, which includes Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, Philippines, Singapore, Thailand, Timor Lester, Vietnam, Christmas Island, and the Cocos Islands; and Western Asia, which includes Georgia, Armenia, Azerbaijan, Turkey, Cyprus, Syria, Lebanon, Israel, Palestine, Jordan, Iraq, Iran, Kuwait, Bahrain, Qatar, and Saudi Arabia.