Asia is the world's largest and most populous continent.  It covers 8.6% of the Earth's total surface area (or 29.9% of its land area) and with approximately 4 billion people, it accounts for 60% of the world's current Human population. It is located chiefly in the eastern and northen hemispheres. Area  of  Asia - 17 212 000 sq. mi.

Asia is traditionally defined as part of the landmass of Eurasia - with the western portion of the latter occupied by Europe - lying east of the Surz Canal, east of the Ural Mountains, and south of the Caucasus Mountains and the Caspian and Black Sea.  It is bounded on the East by the Pacific Ocean,  on the South by the Indian Ocean,  and on the North by the Arctic Ocean.  Given its size and diversity, Asia - toponym dating back to classical antiquity - is more a cultural concept incorporating a number of  regions and peoples than a homogeneous physical. 

There are 47 countries  located in  Asia:
Afghanistan, Armenia, Azerbaijan, Bahrain,  Bangladesh, Bhutan, Brunei, Cambodia, China,Cyprus, Georgia, India, Indonesia, Iran,  Iraq, Israel, Japan, Jordan, Kazakhstan, Kuwait, Kyrgyzstan, Laos, Lebanon, Malaysia, Maldives, Mongolia, Myanmar, Nepal, North Korea, Oman, Qatar, Pakistan, Philippines, Russia, Saudi Arabia,  Singapore, South Korea,  Shri Lanka, Syria, Taiwan, Tajikistan, Thailand, Turkey, Turkmenistan, Uzbekistan, Vietnam, United Arab Emirates,  Yemen.

No visa needed to Japan. Visa needed to  China, India, and some  more  Asian  countries. Look Destination Guide  for specific Country.

Winds called monsoons influence the climate of much of Asia. A monsoon blows regularly in the same direction during definite seasons. In winter, monsoons from the north move into East Asia and cause cold, dry weather. The wind switches in summer and blows from the seas that lie south and southeast of that region. It causes hot, humid weather.

Most of East Asia's rain falls between April and October. The rainfall is heaviest in the east, and it decreases away from the sea. Monsoons from the northeast pass through South Asia and Southeast Asia from November to March. They cause the coolest weather in those two regions. Beginning in April, monsoons from the southwest send temperatures soaring. From May to October, wet monsoons bring heavy rains from the south seas. Many of these monsoons cause floods.

In Southwest Asia, monsoons affect only the southern and southwestern coasts of the Arabian Peninsula. Most of Southwest Asia has long, hot summers and mild winters. Inland, temperatures often climb above 115° F  in summer. But there are no clouds to keep the daytime heat close to the earth at night. A warm but comfortable night may follow an extremely hot day. The region's heaviest rains fall in Turkey near the Black Sea and in the Caucasus region between the Black and Caspian seas. Some parts of the Arabian Peninsula receive no rain for several years at a time.

Bitter cold polar weather keeps part of northern Siberia's land frozen the year around. In the grasslands in the southwest, the temperatures vary from 3° F  in January to 64° F  in July. Central Asia's climate ranges from extremely cold in its mountain regions to extremely hot and dry in the deserts.