Which volcano in Ecuador had a major eruption in 2015?

The Ecuadorian volcano that had a major eruption in 2015 was Cotopaxi. Rising to about 5,897 meters in the Andes, Cotopaxi is one of the world’s highest active volcanoes and is famous for its nearly symmetrical, ice-covered cone.

The 2015 eruptive episode began with renewed activity in August after a long quiet period. Explosions and ash emissions prompted evacuations and a state of emergency in nearby areas. The volcano’s glaciers made the situation especially concerning because eruptive heat could melt ice and generate lahars—fast-moving volcanic mudflows capable of traveling far down valleys.

Cotopaxi’s 2015 activity included ash columns, gas emissions, and intermittent explosions rather than the kind of enormous explosive event associated with some historic eruptions. Activity later declined, but monitoring continued because the volcano remains capable of future eruptions.

Chimborazo is another famous Ecuadorian peak, but it is not generally considered an active volcano. Tungurahua and Sangay have also erupted, which makes them plausible distractors, yet the 2015 Ecuador eruption in this question points specifically to Cotopaxi.