Nepal, officially the Federal Democratic Republic of Nepal, is a sovereign country in South Asia. It is mainly in the Himalayas, but also includes parts of the Indo-Gangetic Plain. It is landlocked, and borders China in the north and India in the south, east and west, while Bangladesh is located within only 27 km (17 mi) of its southeastern tip and Bhutan is separated from it by the Indian state of Sikkim. Nepal has a diverse geography, including fertile plains, subalpine forested hills, and eight of the world’s ten tallest mountains, including Mount Everest, the highest point on Earth. Kathmandu is the capital and the largest city. Nepal is a multiethnic country, with Nepali as the official language.