Colli Euganei are a group of hills of volcanic origin that rise to heights of 300 to 600 meters from the Padovan-Venetian plain south of Padua. The Euganean Hills were formed in a sub-marine outwelling of basaltic lava during the Eocene, which was followed in the Oligocene by an episode of activity characterized by viscous magma, which formed deposits of trachyte. The Euganean Hills, just visible from Venice,have been celebrated for their picturesque beauty and their hot springs.