The Río Serrano is a glacial river flowing through the Torres del Paine National Park in Chile's Magallanes region. It originates from the Serrano Glacier and offers a multi-day expedition route that connects to the Grey River, allowing paddlers to traverse two national parks. The overall character of the experience is one of remote, expedition-style paddling through some of Patagonia's most dramatic scenery, including views of glaciers and the iconic Paine Massif. The river is known for strong winds and difficult weather, which are major safety considerations. A typical multi-day route involves paddling approximately 30 kilometers over 4-5 hours on the water each day, with distances for specific segments ranging from 16 to 30 kilometers. Common put-ins are in the northern section of the river, sometimes requiring a short carry of kayaks for about 100 meters. Take-outs can be as far as Puerto Natales, reached after navigating from the river into a fjord. Expeditions often utilize riverside camps with facilities like toilets and hot showers. Notable sights along the route include the Serrano Glacier, which is approximately 27 kilometers from the river's source, and the surrounding mountain landscapes. Guided trips are available, ranging from half-day to multi-day adventures, and some itineraries combine kayaking with other activities like horseback riding or boat navigation. The river is used as an access point into Torres del Paine National Park, with some visitors taking Zodiac boats down its length.