North and South America are home to the largest number of wilderness areas.There are 16 such areas, from southern Argentina to Alaska and northern Canada.Africa has 8 wilderness areas, including the

　　thick forests and the grasslands.Australia and New Guinea (几内亚) share 6 areas.Europe has 3 areas and Asia has 2.The Arabian Desert and Antarctica also are considered wilderness areas.

　　The largest wilderness area is the Boreal Forest (北方森林)．It extends for 16­million square kilometers south of the Arctic Circle.The Boreal Forest extends across Alaska, Canada, northern Europe and Russia.The smallest of the 37 wilderness areas is the Sundarbans.It is the world’s largest tidal mangrove forest (红树林)．It covers 10,000 square kilometers of land at the mouth of the Ganges River in India and Bangladesh (孟加拉国)．

　　The study found that wilderness areas cover about 46% of the Earth’s land surface.However, they are home to less than 2.5% of the world’s population.Nineteen of the wilderness areas have only about one person for each square kilometer.Native people usually live in these areas.

　　Wilderness areas help to influence the world’s weather systems and rainfall.They are also home to many plants and animals.Population growth and the spread of agriculture and mining operations threaten wilderness areas.But just 7% of all such areas have some form of official protection.

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