Tigirekskiy Nature Reserve (Russian: Тигирекский заповедник) (also Tigireksky) is a Russian 'zapovednik' (strict nature reserve) in the northwest mid-level mountains of the Altai-Sayan region. The reserve was established for the protection and study of the relic pre-glacial dark taiga of the higher elevations, and the mountain-steppe of the river valleys and lower regions. The site features extensive karst landscape and caves. The reserve is situated in the Zmeinogorsky, Tretyakovsky and Krasnoshchyokovsky districts of Altai Krai. It was formally established in 1999, and covers a total area of 40,693 ha (157.12 sq mi).