Glacier-covered Sara Sara volcano, between Laguna Parinacocha and the Río Ocona, is the westernmost young volcano in Perú. The andesitic stratovolcano was the source of youthful-looking lava flows with prominent levees that traveled about 10 km E into the Río Ocona valley. ristine lava flows on the upper slopes of the volcano and ash layers in peat deposits at its base suggest a very young, probably Holocene age.