Embalse Campo Alegre, formally known as Embalse Campo Alegre Ing. Alonso Peralta, is a reservoir situated at approximately 1,421 meters above sea level in the province of Salta, Argentina. Built in the early 1970s, it lies about 5 kilometers from the town of La Caldera and roughly 30–35 kilometers from the city of Salta. The reservoir is surrounded by hills and ravines characteristic of the yungas ecological zone, where dense subtropical vegetation covers the slopes. The water body covers approximately 1.2 square miles.

Access to the reservoir is via Ruta Nacional 9 heading toward the province of Jujuy, following a mountain road alongside the Río Caldera through the towns of Vaqueros and La Caldera. The nearby facility Camping El Angosto, located a few meters before the reservoir entrance, offers day access with an entry fee and provides kayaking opportunities. The campground operates daily from 9:00 AM to 8:00 PM; overnight camping is not permitted there. Pets are allowed at this facility.

Kayaking is an established activity on the reservoir, and sailing and other water sports are also practiced here. Sport fishing is popular, though paddlers should be aware that seasonal fishing closures are enforced. A fishing ban (veda) has historically run from around June through late November, with restricted zones marked by buoys placed by provincial environmental authorities. During the veda period, fishing is strictly prohibited in the designated areas. A valid Salta fishing license is required for fishing activity.

The reservoir's primary purpose is irrigation and as a water reserve for the city of Salta, which may influence water levels seasonally. The surrounding environment is noted for abundant birdlife, making the shoreline of interest to wildlife observers. The lush yungas vegetation creates a visually distinctive backdrop. Access to the water is free of charge, though fees may apply for use of specific facilities such as camping areas or boat rentals.