Trostian, Mountain summit in Lviv Oblast, Ukraine

Trostian is a 1,232-metre summit in the Skole Beskids, in Lviv Oblast, west of Slavske. It rises on a separate ridge between the valleys of the Opir and Holovchanka rivers and is composed mainly of sandstone. Its north-eastern slopes are steep, at 30–40°, and covered with spruce forest, while the southern slopes are gentler and largely bare; the top is flat and grassy.

The mountain became a recreational destination during the 20th century as interest in mountain sports grew in the Eastern Beskids. Winter activities shaped how people use and visit the slopes today.

The name Trostian comes from the Ukrainian word for reed, though the peak is grassy and treeless on top. The slopes are served by chairlifts and T-bar lifts, and the summit can be reached on foot from the lower station of a 2,750 m chairlift. In Soviet times the mountain hosted the USSR's first hang-gliding meet, with 25 pilots from 11 cities in Ukraine, Russia and Latvia.

The summit can be reached on foot from the bottom station of a 2,750 m chairlift. Ski runs of 1,500–2,000 m descend the eastern, northern and western slopes; the central slopes have two 1,000 m rope-tow lifts, the northern slope one of 1,200 m, and the western slopes three of 1,000 m each. Food and hot drinks are sold on the slopes.

In 1970 the mountain hosted the first hang-gliding rally in the USSR, bringing together 25 pilots from 11 cities of Ukraine, Russia and Latvia. The flat, grassy summit and the open slopes above the Opor valley made it a launch point for early delta-wing flying.