Tajikistan officially the Republic of Tajikistan is a mountainous landlocked country in Central Asia. Afghanistan borders it to the south, Uzbekistan to the west, Kyrgyzstan to the north, and People's Republic of China to the east. Tajikistan also lies adjacent to Pakistan but is separated by the narrow Wakhan Corridor.

Most of Tajikistan's population belongs to the Tajik ethnic group, who share culture and history with Afghanistan and speak the Persian language (officially referred to as Tajiki in Tajikistan). Once part of the Samanid Empire, Tajikistan became a constituent republic of the Soviet Union in the 20th century, known as the Tajik Soviet Socialist Republic (Tajik SSR). Mountains cover over 90% of this Central Asian republic.