One of the highest mountains in Ukraine (2,016 m or 6,614 ft). Located in Rakhiv district of Zakarpattia region within Carpathian Biosphere Reserve (Chornohirskyi protected massif). The name comes from the old word (не венгерский) oszteto, which means "gray top".
The mountain slopes are covered with subalpine and alpine meadows, many of the local species are relics. At 1,801 m (5,909 ft) in the north-eastern slope between Hutyn Tomnatyk and Brebeneskul mountains a lake Brebeneskul is situated.
