Havránok is an important archaeological site in northern Slovakia. It is located on a hill above the Liptovská Mara water reservoir around 2 km from the village of Bobrovník, about halfway between Ružomberok and Liptovský Mikuláš in the Liptov region. The archaeologists unearthed a prehistoric Celtic hill fort and a medieval wooden castle in the 1960s, during the construction of the Liptovská Mara dam. Both objects have been partially reconstructed.