Since you have tagged this with "landforms" and "culture" and "language," you are clearly asking about many kinds of contrasts. In each of these areas, Asia has huge contrasts.
Asia has jungles in some areas like Vietnam, tundra in Siberia, and desert in Mongolia. It has a totally secular and modern culture in Japan, an oppressive totalitarian state in North Korea, and societies where every action is determined by the ideas of religious leaders as in Iran and Saudi Arabia.
Because Asia is such a huge continent, it is almost inevitably a land of contrasts.
Asia is a continent of contrasts in many ways. These include contrasts in religious, economic, political, social, and geographical areas. There are many religions throughout the Asian continent. People practice the religions of Buddhism, Islam, Hinduism, Christianity, and Judaism. In the area of economics, there are countries which have economies based on free market, capitalistic ideas while other countries which have very controlled, Communistic concepts. In addition, some countries are much more developed than others. People in these developed countries have a much higher standard of living. Politically, there are countries with democracy and many freedoms while other countries have political systems which give their people little to no say in the government, have very few freedoms, and have abuses of human rights. Socially, there are countries where all people may pursue their goals and dreams. On the other hand, there are countries where some members of society face repression and restriction. Geographically, there are many differences. There are huge cities in some places while in other places there are many tiny, rural villages. There are fertile plains as well as many deserts. There are areas of rugged mountains as well as areas with vast jungles. The continent of Asia is filled with many contrasts. It is a continent that is very deserving of the title "The Land of Contrasts."
Asia is a land of contrasts in a number of ways.
It is home to global economies (India and Japan), a controlled economy (China) and a totalitarian economy (North Korea). There are capitalistic, socialistic and mixed economies in Asia.
It is also home to some of the largest economies (China, India and Japan) and some of the smallest (Maldives, Bhutan, etc.).
The geography is also diverse, with deserts in some place, oceans in others and flat lands in yet other places.
The natural resources are also non-uniformly distributed, with some of the largest oil reserves in the Mid-East and Russia, while total scarcity in Japan.
It is also home to different types of governing systems. India has the largest democracy in the world, while China is the largest communist country (in terms of population) and North Korea is a totalitarian regime. Some countries have monarchies (Nepal, Saudi Arabia, etc.; although they may co-exist with some form of elected government). Religious leaders rule some countries.
Some places have better employment prospects and higher standards of living (such as Japan and South Korea), while others are war-torn (Iraq, Afghanistan, etc.) and suffer from famines, droughts, epidemics, terrorism, etc.
It has countries with some of the largest armed forces in the world (China and India), while some have limited self-defense capability (Mauritius). The distribution of nuclear weapons is a similar story, with some nuclear powers (China, India, Pakistan, Japan) and others non-nuclear.