Dique Cuesta del Viento is a hydroelectric reservoir located in the department of Iglesia, in the northern part of San Juan province, approximately 170–200 kilometers north of the provincial capital via Ruta Nacional 40. The reservoir sits at an elevation of 529 meters above sea level and covers roughly 1,600 to 3,000 hectares. It was formed at the confluence of the Río Blanco and the Arroyo Iglesia, where the Río Jáchal begins, and serves as the most significant hydroelectric infrastructure in the northern region of the province. The nearest town is Rodeo, which provides camping, supplies, accommodation, and food options for visitors.

The reservoir is widely recognized as one of the best windsurfing and kitesurfing destinations in the world, with winds exceeding 20 knots on more than 300 days per year. This wind pattern has a direct and important bearing on paddling: mornings are calm and the water presents as a flat, emerald-green mirror, making that window the recommended time for kayaking and stand-up paddleboarding. From midday onward, the Zonda wind — a dry, warm wind that descends from the Andes — builds steadily and can reach extreme speeds, creating choppy to rough conditions that are unsuitable for flatwater paddling. Paddlers should plan to be off the water well before noon.

The water is clean and visually striking, with a distinctive green color that contrasts sharply against the dark surrounding rock formations. The reservoir contains a series of small islands referred to locally as the "Islas Griegas," which can be explored by kayak during the calm morning hours. The beach areas are pebbly and small in size. Swimmers can be a potential hazard for water users.

The best overall period to visit is from November to March, with the peak wind season running from mid-October through early May. The climate is warm, dry, and semi-arid, with a wide daily temperature range. Facilities at the reservoir include camping, a grocery store, restrooms, showers, rental equipment, and instructional schools. The site hosts national and international windsurfing and kitesurfing competitions, so paddlers should be aware of increased water traffic during event periods.