The Tuostakh (; , Tuostaax) is a river in the Verkhoyansk District, Sakha Republic (Yakutia), Russia. It is a left hand tributary of the Adycha, of the Yana basin. The river is long, having a drainage basin of . Russian State Water Register - Река Туостах
Thymallus, lenok and taimen are found in the waters of the river. The name of the river originated in the Yakut word "tuos", meaning "birch" Water of Russia - Туостах The nearest city is Batagay, and the nearest airfield Batagay Airport.Google Earth
The main tributaries of the Tuostakh are the Dogdo and the Tirekhtyakh, both from the right. The river freezes in October and stays under thick ice until the end of May or early June. There are about 40 in the Tuostakh basin, with a total surface area of .
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