Nepal, officially the Federal Democratic Republic of Nepal, is a landlocked country in South Asia. It is mainly situated in the Himalayas and also includes parts of the Indo-Gangetic Plain. It borders China to the north and India to the south, east, and west, while it is narrowly separated from Bangladesh by the Siliguri Corridor and from Bhutan by the Indian state of Sikkim. Nepal has diverse geography, including fertile plains, forested hills, and eight of the world's ten tallest mountains, including Mount Everest, the highest point on Earth. Kathmandu is the nation's capital and largest city. Nepal is a multi-ethnic, multi-lingual, multi-religious, and multi-cultural state, with Nepali as the official language.