The total area of land on earth is about 149 million square kilometers, or about 39 percent of the total area of the earth.
The average height of the land is about 750 metres above the sea level .The Eurasian（欧亚的）land mass is the largest with an area of 54,527,600 square kilometers .The smallest continent is the Australian mainland, with an area of about 7,614,600 square kilometers, which together with Tasmania, New Zealand, New Guinea and the Pacific Islands, is described as Oceania .The total area of Oceania is about 8,935,500 square kilometres, including West Iran which is political in Asia .
