Tianjin, also Tientsin and T'ien-chin, China, the nation's third largest city. It lies on the Hai He at its junction with the Grand Canal, 31 miles (50 km) east of the Bo Hai, an arm of the Yellow Sea.
China is by far the most populous country on earth, with one-fourth of the world's total population inside its borders. It is also the world's oldest continuing civilization.
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