Ostry (709 m a.s.l.) is a striking forested cone rising above the Olza valley near Třinec in the Silesian Beskids. Its sharp, elegant shape sets it apart from the surrounding ridges, and the fact that the Polish-Czech state border runs right across its summit gives every hike here a pleasantly adventurous edge.

The peak sits on a lateral ridge stretching westward from Malá Čantoryje, and its distinctive silhouette is the result of unusual geology — dark, marly shales topped by a cap of harder sandstone layers. Dense forest covers Ostry year-round, making it a cool escape in summer and a wonderfully colourful destination in autumn. The atmosphere is quiet and wild, with no tourist infrastructure on the summit itself — just trees, rocks, and the invisible line of the border beneath your feet.

How to reach the summit:

• From Třinec (Czech Republic) — red trail heading towards Velká Čantoryje; the trail passes just below the summit on the southern side.
• From Leszna Górna (Poland, Cieszyn County) — approach from the northern slopes of the village.

Practical information:

• The Polish-Czech state border crosses the summit ridge — hikers on the red trail will cross it in this area.
• The red trail runs below the actual summit, skirting it to the south — reaching the highest point requires a short detour off the main path.

Ostry has a close companion: Mały Ostry (approx. 588 m), located about 750 metres to the west along the same ridge and built from the same geological formations — a real treat for anyone interested in Beskid geology.