Dique Punta Negra is a reservoir and hydroelectric dam situated on the Río San Juan, straddling the boundary between the departments of Ullum and Zonda in the south-central part of San Juan Province, Argentina. Inaugurated in 2015 after construction began in early 2010, the dam represents a significant infrastructure investment of approximately 410 million dollars. It was designed to serve as a compensating reservoir for the upstream Represa Los Caracoles, optimizing hydroelectric generation while also providing irrigation water for the region's productive agricultural lands — particularly vineyards and olive groves. The reservoir sits within a striking Andean landscape that visitors frequently compare to Patagonian scenery, with rugged terrain and dramatic views forming the backdrop for fishing and outdoor recreation. Sport fishing is available at the lake nearly year-round, making it a reliable destination for anglers in the San Juan region.