The Río Jáchal is a permanent river in the province of San Juan, Argentina, and one of the most significant watercourses in the region. It originates from the confluence of the Río de la Palca and the Blanco River in the northwest of San Juan, and forms part of the Desaguadero River basin. The river carries an average flow of 9 cubic metres per second. Its name derives from the native Cacana language and is most commonly interpreted as meaning "dragged stones."

The most notable paddling feature on the Río Jáchal is the canyon section known as the Garganta del Río Jáchal, located approximately 27 kilometres from the town of Jáchal and around 180 kilometres from the provincial capital of San Juan. This canyon is defined by narrow rock walls exceeding 30 metres in height, through which the river winds and generates rapids. The canyon section is a challenging run with rapids and drops reaching speeds of 30 to 40 kilometres per hour, making it suitable for both rafting and kayaking. The surrounding landscape is arid and desert-like, with significant geological formations visible along the route.

The canyon has historically attracted commercial rafting operations, and at least one local outfitter, La Morada Aventura, offers guided rafting trips on the Río Jáchal along with kayak instruction aimed at beginners. The river has also served as a venue during San Juan's broader adventure tourism events, including during the 2017 Kayak World Championship held in the region.

Given the remote and rugged character of the canyon, independent access without a guide or local operator is not straightforward. Water levels in the canyon have varied noticeably over the years, with higher flows observed in earlier decades. Paddlers planning a trip should verify current water levels and engage a local operator familiar with the section, as the canyon's narrow walls and rapid character demand appropriate preparation.