Southern Volcanic district. The peaks of southern Chile, which bear strong resemblance to the mountains of the American Northwest, are mostly isolated ice volcanoes and rocky spires that rise above dense forests. One of the few that had remained with no recorded ascent was Las Yeguas (locally called San Pedro; 3499 meters or 11,447 feet), which was climbed by Juan Barrera, Sergio Kunstmann and Fernando Novoa on December 27, 1969. The peak is heavily glaciated on its southern and western slopes.