Regional Park
Birzai Regional Park
A unique karst landscape with sinkholes and underground rivers. Kirkilai lakes are a natural wonder created by karst processes.
Birzai Regional Park, established in 1992, protects a karst landscape unique in Lithuania. There are more than 9,000 karst sinkholes here – the only such phenomenon in Lithuania. The Kirkilai lakes nature trail leads through blue-water lakes formed in karst collapses. The park features the rebuilt Biržai Castle – one of the largest bastion fortresses in Lithuania, housing the "Sėla" museum. The surroundings are rich in manor estates and traditional Biržai region breweries. The park is in northern Lithuania, near the Latvian border.