The Aruküla Caves are located in northwestern Tartu, Estonia near the Jõgeva road on the left slope of the Emajõgi primeval valley. The man-made caves consist of three entrances through white sandstone with a brownish-red sandstone interior that is 1-1.5 meters high. The caves have been known for over 150 years as an important site for discovering Devonian fish fossils and are a winter hibernation spot for local bat populations.