Asia is the world’s largest and most populous continent, located primarily in the eastern and northern hemispheres. It covers 8.7% of the Earth’s total surface area and comprises 30% of its land area. With approximately 4.3 billion people, it hosts 60% of the world’s current human population. Asia has a high growth rate in the modern era. For instance, during the 20th century, Asia’s population nearly quadrupled.
Asia is defined as comprising the eastwards four-fifths of Eurasia. It is located to the east of the Suez Canal, the Ural River, and the Ural Mountains, and south of the Caucasus Mountains (or the Kuma–Manych Depression) and the Caspian and Black Seas. 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.