The question is almost impossible to answer because we do not know the condition of the land to start with. Arable land is land that can be, or is cultivated. Can the land be capable of being tilled or plowed for the production of crops. The location of the land is important, To hot or to cold, salty, rainy, snowy, polluted or are the nutrients poor. Converting non arable land into a fit condition may require fertilization, water/irrigation, planting of trees and also consider access for both man and machinery. Consider also if all this is cost effective.
150,000,000 sq km/57,500,000 sq mi
If the land area of the earth was greater than the area of the world's ocean, the earth's climate would become much drier because of the reduced source of moisture. The temperature would also increase dramatically.
Area of China: 9,640,821 km2 (3,765,945 mi2) or 9,671,018 km2 (3,777,741 mi2), depending on whether the administrative regions of Hong Kong, Macau or Taiwan are taken into consideration.
Continents and Islands
An island
15% of the earths surface is livable. Of the 28% of the surface of the Earth that is land, arable land (that can be farmed) accounts for about one eighth (13%), there are permanent crops on about a twentieth (5%), permanent pastures on a quarter (26%) forest and woodlands cover one third (32%) cities 1.5% (and increasing!) and other unusable areas about a third (30%)
The Earth's largest land areas are the continents.
30%
yes
yes
150,000,000 sq km/57,500,000 sq mi
Africa covers about 20% of Earth's land area.
no water covers 71% of the earths surface and land 29%
water covers a bigger area of earths surface in ration 3 : 1
nothing
nothing
Asia is the largest continent in terms of land area. It covers around 30% of the Earth's land area and is home to more than half of the world's population.