The overall defining landscape of Deschutes County is primarily marked with that of lava flows. Most of the lava found in Deschutes County issued forth from Newberry Volcano located just south of Bend. Because of this, many lava tubes are located within, including the prominent Lava River Cave. As a consequence, the county is the most cave-rich in the state of Oregon, with over 500 known caves in the county. Other prominent lava flows exist too, especially those related to the Mount Bachelor Volcanic Chain which consists of Mt. Bachelor as well as three smaller shield volcanos, and a series of cinder cones.