Both the main caldera and the Alpehué crater contain glaciers, which in the caldera reached a thickness of 650 m (2,130 ft) in 1992 and fills it; the total volume was estimated at 6 km³ (1.4 cu mi) in 1992.
These glaciers feature typical ice structures such as crevasses and there may be a subglacial lake in the caldera.
Three lakes are found in the caldera at its margins, the easterly Sharkfin lake, the southeasterly Dome lake and the southwesterly Alpehué lake.
These glaciers drain to the north and northwest; the latter glacier flows from the caldera through the Alpehué crater into the valley of the same name, which is drained by the Rio Alpehué into the Rio Allipén river.
Other than the caldera and crater glaciers, the only snow cover on Sollipulli is seasonal.


The glacier within the caldera of Sollipulli is shrinking; its surface area decreased between 1961 and 2011 and the Alpehuén outlet glacier retreated by 1.3 km (0.81 mi).
The process of glacier retreat is probably accelerated by ash being deposited on the glacier through eruptions at the neighbouring volcano Puyehue-Cordón Caulle; activity at the other volcanoes Llaima and Villarrica may have the same effect.
In 2011, the volume of the glacier was 4.5 ± 0.5 km³ (1.08 ± 0.12 cu mi).
Melting of the glacier risks generating lahars and putting water supplies in the region into jeopardy.
Both the main caldera and the Alpehué crater contain glaciers, which in the caldera reached a thickness of 650 m (2,130 ft) in 1992 and fills it; the total volume was estimated at 6 km³ (1.4 cu mi) in 1992. These glaciers feature typical ice structures such as crevasses and there may be a subglacial lake in the caldera. Three lakes are found in the caldera at its margins, the easterly Sharkfin lake, the southeasterly Dome lake and the southwesterly Alpehué lake. These glaciers drain to the north and northwest; the latter glacier flows from the caldera through the Alpehué crater into the valley of the same name, which is drained by the Rio Alpehué into the Rio Allipén river. Other than the caldera and crater glaciers, the only snow cover on Sollipulli is seasonal.

The glacier within the caldera of Sollipulli is shrinking; its surface area decreased between 1961 and 2011 and the Alpehuén outlet glacier retreated by 1.3 km (0.81 mi). The process of glacier retreat is probably accelerated by ash being deposited on the glacier through eruptions at the neighbouring volcano Puyehue-Cordón Caulle; activity at the other volcanoes Llaima and Villarrica may have the same effect. In 2011, the volume of the glacier was 4.5 ± 0.5 km³ (1.08 ± 0.12 cu mi). Melting of the glacier risks generating lahars and putting water supplies in the region into jeopardy.
Sollipulli