The Río Ancajuli is a watercourse located in the hills of Tucumán, Argentina, flowing through an area described as one of the most picturesque in the region. The river's character is closely tied to the surrounding landscape, which features dry, hilly terrain. Notably, sections of the river and its tributaries, such as the Río Los Planchones, can run dry or flow underground, indicating a water level that is highly dependent on seasonal rainfall. This suggests paddling may only be viable during specific wet periods, and the river is not a perennial, consistently flowing waterway. The overall experience is likely one of exploring a rugged, arid environment rather than a lush river valley.

Access to the area is possible via established hiking trails, such as a route from the town of Vipos to Anca Juli that follows the river, taking approximately four hours on foot each way. This implies that any paddling put-in or take-out points would require significant trekking to reach, limiting the activity to multi-day, expedition-style trips where gear must be carried in. Basic lodging is available at a location called Los Rasgido at the end of the trail from Vipos, which could serve as a base camp. The river and its surroundings offer a remote trekking destination, but specific details regarding paddling routes, water conditions, hazards, regulations, water temperature, quality, or dedicated facilities for boaters are not available.