Lena Pillars (Russian: Ле́нские столбы́, tr. Lenskiye Stolby) is the name given to a natural rock formation along the banks of the Lena River in far eastern Siberia. The pillars are 150–300 metres (490–980 ft) high, and were formed in some of the Cambrian period sea-basins. The Lena Pillars National Park was inscribed on the World Heritage List in 2012.