Ticsani, Stratovolcano in Moquegua Region, Peru

Ticsani is a volcano 59 km northwest of Moquegua, formed by two edifices: Old Ticsani, a collapsed compound volcano now preserved as a 3 km arcuate ridge opening west, and Modern Ticsani, three aligned lava domes with two partly destroyed craters. The complex reaches 5,408 m; the middle dome, about 2 km wide, is the largest. The summit carries snow and ice, and two small dark lakes lie on a pale volcanic fan on the right flank.

Old Ticsani, a compound volcano, collapsed in the Pleistocene, sending 15–30 km³ of debris down the Río Tambo valley as far as the Pacific. The modern edifice then built three lava domes, the southeastern oldest and the northwestern youngest. The "Grey Ticsani" pumice eruption occurred about 10,600 years ago, and the last, "Brown Ticsani", came after Huaynaputina's 1600 eruption.

Twelve villages lie near the volcano, including Calacoa, San Cristóbal, Carumas, Cuchumbaya and Soquezane, home to more than 5,000 people. High-temperature springs rise close by, and some are used as thermal baths by those communities. The volcano is also known as Tiksani in Quechua.

Ticsani lies in Ichuna District, 59 km northwest of Moquegua; the Ilo-Desaguadero highway passes within 12 km of the domes, and paved roads give access. The Putina River runs to the northwest and the Carumas to the southwest. The area is remote, which has hampered exploration, and the volcano has been monitored by the Peruvian government since 2015.

The two dark lakes on the pale fan on the right flank are not crater lakes but small bodies of water set in the lighter volcanic deposits. The fan itself is a field of pyroclastic-flow deposits that filled shallow valleys on the eastern side during the collapse and growth of the lava domes.