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Bhutan (Dzongkha: འབྲུག་ཡུལ་, tr ʼbrug-yul, "Druk Yul"; Nepali: भूटान, Bhūṭān), officially the Kingdom of Bhutan, is a landlocked state in South Asia, located at the eastern end of the Himalayas and bordered to the south, east and west by the Republic of India and to the north by the People's Republic of China. Bhutan is separated from the nearby country of Nepal to the west by the Indian state of Sikkim, and from Bangladesh to the south by the Indian states of Assam and West Bengal.

Bhutan existed as a patchwork of minor warring fiefdoms until the early 17th century, when the area was unified by Shabdrung Ngawang Namgyal, who fled religious persecution in Tibet and cultivated a separate Bhutanese identity. In the early 20th century, Bhutan came into contact with the British Empire, after which Bhutan continued strong bilateral relations with India upon its independence. In 2006, Business Week magazine rated Bhutan the happiest country in Asia and the eighth-happiest in the world, based on a global survey.

Trongsa, previously Tongsa (ཀྲོང་གསར་, Wylie: krong gsar), is a town and capital of Trongsa District in central Bhutan. The name means "new village" in Dzongkha. The first temple was built in 1543 by the Drukpa Kagyu lama, Ngagi Wangchuk, who was the great-grandfather of Shabdrung Ngawang Namgyel, the person who unified Bhutan.

Chökhor Raptentse Dzong at Trongsa which was built in 1644, used to be the seat of power of the Wangchuck dynasty before it became rulers of Bhutan in 1907. Traditionally the King of Bhutan first becomes the Trongsa Penlop (governor) before being named Crown Prince and eventually King. Built on a mountain spur high above the gorges of the Mangde Chhu, the dzong controlled east-west trade for centuries. The only road connecting eastern and western Bhutan (the precursor to the modern Lateral Road), passed through the courtyard of the dzong. At the command of the penlop the massive doors could be shut, dividing the country in two.

Higher yet on the mountainside is a watchtower, called "Ta Dzong", to guard the dzong from enemies.