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Vietnam, in Southeast Asia, stretches 1,600 kilometers (1,000 miles) north to south, but is only about 40 kilometers (25 miles) wide at its narrowest point near the country's center. The Red River delta lowlands in the north are separated from the huge Mekong Delta in the south by long, narrow coastal plains backed by the forested Annam highlands. Hanoi, the capital, is the main city on the Red River and Ho Chi Minh City, or Saigon, is the main city on the Mekong.