Arroyo Blest is a watercourse in Río Negro, Argentina, flowing within the larger Nahuel Huapi Lake system, specifically the Blest branch. This area is accessed via Puerto Blest, a port on the lake, which serves as a primary gateway for visitors and paddlers. The surrounding landscape is characterized by the deep, distinctive green hues of the lake's water, creating a memorable visual experience. A notable nearby feature is the Cascada de los Cántaros waterfall, a popular sightseeing destination. The region is part of a National Park, and visitors, including Argentine residents, should be prepared to pay an entrance fee at the port, with identification required for a resident rate.

For paddlers, multi-day kayak expeditions are available on the Blest sound of Lake Nahuel Huapi. One such itinerary is rated as difficult, covering approximately 16 kilometers or 10 miles over four hours of paddling on the first day, with a free campsite used for overnight stays. The terrain in the broader area can present hazards, including potential avalanche zones on certain land routes. The presence of organized, guided kayak trips indicates the water body is suitable for experienced paddlers seeking a challenging adventure in a protected natural setting with significant scenic value.