The nation of Mongolia (in dark green) flanked by the much larger countries of Russia and China
Mongolia was an ancient nation state of Earth which lasted, in one form or another, until at least the 21st century. Mongolia was a land locked country between the much larger nations of Russia and China.
Once itself part of the Chinese Empire, Mongolia was once the base of Genghis Khan who would conquer much of China and Asia during the early Middle Ages on Earth. Mongolia was also once controlled by China, with the region of Outer Mongolia a district of the Chinese Empire.
Maps of the Earth, including Mongolia, were present on the library computer of the USS Enterprise in 2254. (TOS: "The Cage")
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