Bhutan:
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Bhutan officially the Kingdom of Bhutan, is a landlocked state in South Asia located at the eastern end of the Himalayas. It is bordered to the north by China and to the south, east and west by India. Further west, it is separated from Nepal by the Indian state of Sikkim, while further south it is separated from Bangladesh by the Indian states of Assam and West Bengal. Bhutan's capital and largest city is Thimphu.

Nepal:
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Nepal officially the Democratic Republic of Nepal, is a landlocked sovereign state located in South Asia. With an area of 147,181 square kilometres (56,827 sq mi) and a population of approximately 27 million (and nearly 2 million absentee workers living abroad), Nepal is the world's 93rd largest country by land mass and the 41st most populous country. It is located in the Himalayas and bordered to the north by the People's Republic of China, and to the south, east, and west by the Republic of India. Specifically, the Indian states of Uttarakhand, Uttar Pradesh, Bihar, West Bengal, and Sikkim border Nepal, while across the Himalayas lies the Tibetan Autonomous Region. Nepal is separated from Bangladesh by the narrow Indian Siliguri corridor. Kathmandu is the nation's capital and largest metropolis.

Bangkok-Veitnam:
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Bangkok is the capital and the most populous city of Thailand. It is known in Thai as Krung Thep Maha Nakhon or simply About this sound Krung Thep (help·info). The city occupies 1,568.7 square kilometres (605.7 sq mi) in the Chao Phraya River delta in Central Thailand, and has a population of over eight million, or 12.6 percent of the country's population. Over fourteen million people (22.2 percent) live within the surrounding Bangkok Metropolitan Region, making Bangkok an extreme primate city, dwarfing Thailand's other urban centres in terms of importance.