Lake Cholila is part of a vast interconnected system of lakes fed by the glacier fields high up along the Andean mountain range. Volcanic in origin, this spectacular cordillera is the backbone of the continent. The surface area of Lake Cholila is 5,500 hectares and it lies at 590 meters above sea level. Its waters are 90 meters deep in parts which shimmer from slate gray to turquoise blue, reflecting the Dos Picos and Tres Picos mountains, 2,530 meters and 2,492 meters high respectively.
The Lake is fed by four streams that flow down from the mountains offering excellent options for walking and fishing. 
El Turco flows down from the Tres Picos mountain on the north end of the lake, an attractive afternoon’s walk, and also a good location for brook trout, while the stream which has its source on the south side of the Tres Picos is called Pasto Miel, honey grass, by the locals for the icy sweetness of its waters which can be drunk.
On the south end of the lake, the aptly-named Cascada stream plunges 35 meters down a rock face in the middle of the forest before flowing into the Cholila.
The largest river feeding the lake is the Tigre on the west side, flowing straight down from the glacier of the same name.
The Carrileufú river flows out of the lake on the east side for 35 km, a great way to spend the day boating or fishing.
Climate
Because of its proximity to the mountain range, the climate in Cholila is highly changeable, and can shift from warm bright sunshine to wind and rain in a matter of minutes during the course of the day. Visitors should come prepared with all-weather gear, including sun protection as the sun’s rays at this latitude are particularly strong.  On the plus side are the endless summer evenings and early sunrises.