Saco Viejo is a coastal bay located near San Antonio Este in the Río Negro province of Argentine Patagonia. It is part of a coastal area sometimes referred to as the "Patagonian Caribbean," known for its scenic, less commercialized beaches with clean sandy shores and calm waters. The bay faces Playa Las Conchillas, a beach noted for its peaceful ambiance and gentle waves, making the adjacent waters suitable for relaxed paddling. The overall vibe of the area is laid-back and family-friendly, with an unspoiled natural setting. The region experiences consistent winds, which are a constant and defining feature of the landscape; paddlers should anticipate wind as a significant factor and plan accordingly. For a multi-day visit, it is advisable to bring all necessary supplies, as access to provisions in the immediate area can be limited and unreliable. A specific kayaking route exists between Saco Viejo, Las Conchillas, and San Antonio Este, covering a distance of approximately 3.75 kilometers. This route passes by historical ruins, adding a point of cultural interest to the journey. The trail is also used for hiking, indicating shared shoreline access. The beach at Las Conchillas is a known camping location, offering the possibility for overnight trips. The water is part of the cooler Patagonian coastal ecosystem, supporting diverse local flora and fauna.