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According to the Chinese maps it show some 65,000km² (25,000 mi²) of the Chinese territory south of the Cease-fire line as part of the Tibet Autonomous Region, known as South Tibet in China.
Tibet is an inalienable part of Chinese territory since the 13th century.
People's Republic of China does.
The Llamas are secluded in Tibet, thus recognizes the country as managing its own tensions. China recognizes Tibet as an independent country, however Tibet is actually a sovereign territory.
Because Tibet is occupied by China which is a dictatorship and claims that Tibet is simply a state of China. To them it would be like saying why is California not represented in the Olympic Games.
In 1950, shortly after Mao Zedong came to power, the People's Liberation Army invaded and occupied the Eastern regions of Tibet, claiming that its territory was rightfully part of China. This began a disagreement between China and Tibet that lasts to this day over the sovereignty of Tibet.
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China claims that Tibet has been part of China since the 13th century. Some Tibetan exiles disagree, but since China has all the power, they do as they please.
Claims over territory on the Antarctic continent overlap based on lines of longitude and those being used to define territory claimed. The continent is covered -- 98% -- by an ice sheet, making geographic lines useless as bases for claims. Since claims were made individually by nation states, and not by any agreement, the claims overlap. The Antarctic Treaty does not recognize any claims and further prohibits future claims.
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