4the northwestern part of outer china is know for its great desert ,including the Taklamakan and Gobi desert .the deserts are harsh places to live and difficult for travelers to cross climate varies from sizzling hot in the summer to below freezing in winter only places to grow crops of raise animal such as sheep are the oases where water can be found ancient times shelters made of mud were sometimes built near oases.
A natural part of the earth which is difficult to cross, such as mountain ranges or wide rivers.
Mountain ranges are natural barriers because they are high. That makes it difficult or impossible for various forms of life to cross from one side of a mountain range to the other.
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the Andes
The Himalayas in the north and the Hindu Kush in the northwest served as natural barriers that protected India from outside invaders. These mountain ranges made it difficult for invaders to cross into the Indian subcontinent, providing a natural defense against potential threats.
They crossed the Rocky Mountain Range...good luck!
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They would have to cross the Himalayas, Karakorum, and Kunlun mountain ranges.
The transcontinental railroad crossed the Rocky Mountains and the Sierra Nevada mountain ranges. These ranges presented significant challenges to railroad construction due to their rugged terrain and elevation.
You would cross the Rocky Mountains while traveling from California to Texas.
Sierra Nevada
The Alaska Mountain Range and the Kaiyuh (: suckas ;)