Planchón-Peteroa

{{Infobox mountain

| name = Planchón-Peteroa

| photo = Planchon Peteroa.jpg

| photo_caption = Peteroa as seen from the summit of Planchón.

| elevation_m = 4107

| elevation_ref =

| location = Argentina-Chile

| range = Andes

| map = Argentina |relief=1

| map_size = 230

| label_position = right

| coordinates = {{coord|35|14|24|S|70|34|12|W|type:mountain_region:CL|display=inline,title}}

| type = Complex volcano

| age =

| last_eruption = February to June 2011{{cite gvp|vn=357040|name=Planchón-Peteroa}}

| first_ascent =

| easiest_route =

}}

Planchón-Peteroa is a complex volcano extending in a north–south direction along the border between Argentina and Chile. It consists of volcanoes of various ages with several overlapping calderas. Those include Volcán Planchón, Volcán Peteroa and Volcán Azufre.

A partial collapse of the complex about 11,500 years ago produced a major debris avalanche, which followed the course of the Teno River until reaching the Chile Central Valley.

Peteroa has a crater lake. Lagunas de Teno lies at the foot of Planchón volcano. In this area also is the Vergara International Pass.

September 6, 2010 eruption

Planchón-Peteroa Volcano erupted on September 6, followed by a stronger eruption on September 18. On September 21, the volcano erupted once again, emitting a dark gray plume of volcanic ash. As winds blew the ash southeast into Argentina, residents there were warned by authorities to evacuate the nearby areas before Planchón-Peteroa would erupt again.