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The Gobi desert
The most notable is the Himalayan mountain range.
No!!
The northern border of the Roman province of Britannia was Hadrian's Wall.
The Caucasus Mountains
The Caucasus Mountains
China is bordered on the north by the Gobi Desert. The eastern portion of the northern border consists of the Amur River, and the westernmost part of the northern border includes the Tian Shan mountains and the Turfan Depression. The countries that border China on its north are Russia and Mongolia.
The Great Wall of China is the human-built feature that marked China's northern border. It was a series of defensive walls and fortifications constructed to protect the Chinese states and empires against invasions by various nomadic groups from the Eurasian Steppe.
The Caucasus Mountains
The Caucasus Mountains
Hadrian's Wall in Britain the Danube River in Continental Europe