Embalse Casa de Piedra is a large artificial reservoir formed by a dam on the río Colorado, sitting on the natural boundary between the provinces of La Pampa and Río Negro in southwestern Argentina. The reservoir covers approximately 360 km² (36,000 hectares) with a shoreline of 55 kilometers, making it one of the more substantial bodies of water in the region. Construction ran from 1983 to 1996, and the dam serves hydroelectric, flood control, and irrigation purposes. The reservoir sits at a crown elevation of 285 meters above sea level, with a total capacity of 4,000 hm³. Maximum depth reaches around 50 meters in the area corresponding to the original channel of the río Colorado, while average depth is approximately 20 meters.

The shoreline is characterized by very gentle slopes, which makes launching and landing straightforward for paddlers and is one of the features that makes the reservoir well suited to kayaking, canoeing, and sailing. Kayak, canoeing, kitesurfing, windsurfing, kiteboarding, and sailing are all practiced here. A boat ramp is available at the villa turística Casa de Piedra on the left bank of the río Colorado, downstream of the dam.

The villa turística Casa de Piedra is the main service hub for visitors. It is accessible via Ruta Nacional 152 and Ruta Provincial 34, located approximately 350 kilometers from Santa Rosa and 960 kilometers from Buenos Aires. The settlement offers accommodation options including rental cabins and a hotel, as well as restaurants serving regional food. A small viewpoint about 800 meters from the water provides an elevated perspective over the reservoir. A small airstrip is located west of the town along Ruta Provincial 34.

The provincial energy and mining authority conducts regular hydrocarbon spill response drills on the reservoir — at least 16 have been carried out — reflecting the proximity of oil and gas operations in the surrounding Puelén department. Paddlers should be aware of this industrial context when planning trips. Sparse vegetation lines the margins of the lake and the río Colorado corridor, and the water varies in color from blue to green depending on suspended sediment levels.