Mount Yana is an extinct stratovolcano in the northern California Cascades near Mineral, Lake Almanor, Chester, and Chico, along the border of Tehama, Plumas, and Butte counties. It is geologically important as the oldest volcanic center in the area, erupting before Lassen Peak and the nearby lava domes formed. Deep erosion has worn away its original cone, leaving the former volcanic center preserved in features such as Butt Mountain, Ruffa Ridge, and Humboldt Peak. Rather than a sharply defined summit, Mount Yana survives as an ancient volcanic remnant that marks an earlier stage in the development of the Lassen landscape and the southern Cascades.