Açude Marechal Dutra, more commonly known as Açude Gargalheiras, is a reservoir located near the town of Acari in the state of Rio Grande do Norte, Brazil. It is a man-made lake created by a dam owned by the Departamento Nacional de Obras Contra as Secas (DNOCS). The reservoir holds significant historical and cultural importance, having been officially recognized as a cultural heritage site of Rio Grande do Norte in January 2022. The water body is part of a regional hydrological system; when it overflows, water is channeled into the downstream Açude Passagem das Traíras on the Rio Grande do Norte river. Specific access points for paddlers, such as boat ramps or public shorelines, are not detailed. Similarly, there is no explicit mention of paddling-specific regulations, restrictions, or designated routes, nor are there details on facilities like rentals, restrooms, or designated parking for recreational users. The overall character of the reservoir is defined by its semi-arid setting and its primary function in water management for the region. Information regarding seasonal water levels, typical water temperatures, water quality, or specific wildlife features is not provided. The notable sight is the dam structure itself, known as Barragem Marechal Dutra, set within the landscape of the Seridó region. Paddlers should be aware that this is a working reservoir, and water levels can fluctuate significantly based on seasonal rains and controlled releases, which are critical safety considerations. The best time for paddling would logically coincide with periods of higher water volume, typically following the rainy season, though precise seasonal guidance is unavailable.