Pululagua is a dormant volcano

Volcano

2. Bedrock3. Conduit 4. Base5. Sill6. Dike7. Layers of ash emitted by the volcano8. Flank| 9. Layers of lava emitted by the volcano10. Throat11. Parasitic cone12. Lava flow13. Vent14. Crater15...

 in the north of Quito Canton, Pichincha Province

Pichincha Province

Pichincha is a province of Ecuador located in the northern sierra region; its capital and largest city is Quito. It is bordered by Imbabura & Esmeraldas to the north, Cotopaxi & Santo Domingo de los Tsáchilas to the south, Napo & Sucumbíos to the east, and Esmeraldas & Santo Domingo de los...

, Ecuador

Ecuador

Ecuador , officially the Republic of Ecuador is a representative democratic republic in South America, bordered by Colombia on the north, Peru on the east and south, and by the Pacific Ocean to the west. It is one of only two countries in South America, along with Chile, that do not have a border...

. The volcano is in the Western Cordillera of the northern Ecuadorian Andes, approximately west-southwest of Mojanda

Mojanda

Mojanda is an inactive stratovolcano of the Eastern Cordillera of the Andes in northern Ecuador. A summit caldera, which was produced by an explosive Plinian Eruption that marked the end of Mojanda activity 200,000 years ago, is presently occupied by three crater lakes: Caricocha , Yanacocha,...

 and north of Casitahua

Casitahua

Casitahua is a dormant, eroded volcano in the north of Quito Canton, Pichincha Province, Ecuador. The volcano is in the Western Cordillera of the northern Ecuadorian Andes, between Pululagua Volcano to the north and Pichincha Volcano approximately to the southwest...

 volcanoes. Pululagua's caldera is approximately 5 km wide.

The volcano is within an Ecuadorian national park known as Reserva Geobotánica Pululahua.

In 467 BCE, Pululagua erupted, sending volcanic ash over much of the western Ecuadorian lowland regions, which greatly reduced the expressions of Chorrera culture.