Sisak Fortress
A triangular fortress at the meeting of two rivers, where an Ottoman advance was stopped in 1593.
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The fortress at Sisak was built in the 1550s on the wedge of land where the Kupa runs into the Sava, three round towers joined by walls in a triangle, put up by the Zagreb chapter against the Ottoman advance up the Sava valley. In June 1593 an Ottoman army besieging it was destroyed by a relief force in a battle that is generally treated as the point at which the Ottoman push into this part of Croatia was halted, and which triggered the Long War. The building now holds part of the Sisak town museum, and the rivers still meet directly outside its walls.
What you actually see
- A triangle of three towers - built in the 1550s at the river junction.
- The battle of 1593 - the relief that broke the siege and the advance.
- Two rivers meeting outside - the Kupa into the Sava.
- A town museum inside - in the fortress buildings.
When to go
April to October; the museum reduces hours in winter. Two hours.
Honest expectations
The fortress is small and the visit is short. Sisak is an industrial town with limited tourist infrastructure. Flooding has affected the site and the area has also had earthquake damage in recent years.
Nearby
Lonjsko Polje and its stork villages are downstream; Zagreb is north-west.
What to pack for Sisak Fortress
Chosen from what this place is for. Tap a kit for the full checklist.
Opening times, ticket prices and seasonal closures change - check the official source before you go: official site.


