Nepal officially the Federal Democratic Republic of Nepal, is a landlocked sovereign state located in South Asia. 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.The mountainous north of Nepal has eight of the world's ten tallest mountains, including the highest point on Earth, Mount Everest, called Sagarmatha It contains more than 240 peaks over 20,000 ft (6,096 m) above sea level. The southern Terai region is fertile and humid. Lumbini, the birthplace of Lord Gautam Buddha, is located in this region. Lumbini is one of the holiest places of one of the world's great religions, and its remains contain important evidence about the nature of Buddhist pilgrimage centres from as early as the 3rd century BC.