Casiri is a high stratovolcano with lava domes close to the border between Peru and Chile; the volcano rises about above the surrounding terrain and has a volume of about , with a diameter of . There are four individual volcanic edifices at Casiri: three older ones that form a 5 kilometre-long chain, and a southeasterly younger edifice with a well preserved lava dome in its crater which is breached to the south. An older lava dome also exists in the western part of the complex and the whole Casiri volcano has formed on the southern flanks of older volcanoes.