The Río Deseado is a tidal estuary, or ría, that flows into the Atlantic near the town of Puerto Deseado in Santa Cruz province, Patagonia. Its character is defined by powerful tidal currents that can move a kayak well over 8 km in roughly an hour, making tide awareness the single most critical factor for any paddling trip here. Paddlers should research tide tables carefully before launching and plan routes that account for both the direction and strength of tidal flow. Local operators such as Darwin Expeditions, based in Puerto Deseado, offer guided tours and can provide current tide information — consulting them before any independent paddle is strongly advisable.

One notable side arm is the Cañadon Torcido, a canyon accessible only from the water and only at high tide. It lies roughly 2 km from the main river channel, though the strong currents make navigation more complex than distances suggest. Missing the entry point and being carried past it is a real risk, as the current makes returning upstream extremely difficult.

Wildlife is a significant draw for paddlers on the ría. Commerson's dolphins are regularly encountered and are known to approach kayaks closely, diving around the hull. Sea lions inhabit small islands within the estuary and are similarly curious around small watercraft. The cliffs along features such as Isla del Rey support nesting colonies of red-legged cormorants and Magellanic cormorants. Magellanic penguins nest on Isla de los Pajaros, which is accessible by water. The combination of marine mammals, seabirds, and dramatic cliff scenery gives the estuary a distinctly wild character typical of coastal Patagonia.

Wind conditions can vary, and while the area can experience calm, pleasant days, Patagonian weather is inherently unpredictable. Paddlers should be prepared for conditions to change and should not underestimate the physical demands of paddling against tidal currents if a return trip is required.