Açude Acaraú-Mirim is a homogeneous earthen dam reservoir located in the município of Massapê, in the state of Ceará, Brazil, at approximately 3°30'S, 40°17'W. Construction was completed in 1907, making it one of the older public reservoirs in the region. The reservoir holds a total capacity of 52 million cubic meters and sits within a hydraulic basin of approximately 497.27 km², belonging to the hydrographic basin of the Vale do Acaraú. It serves as the primary surface water supply source for Massapê and surrounding communities including Grigoro, Santana do Acaraú, and Arraial.

The reservoir is subject to the semi-arid climate of interior Ceará, where water levels fluctuate considerably depending on rainfall. In favorable rainy seasons, the reservoir can reach full capacity and overflow, while prolonged dry periods can significantly reduce water volume. Paddlers should factor these seasonal variations into trip planning, as low water levels may limit navigability or expose hazards.

Water quality is a concern. A 2023 environmental study identified ongoing impacts from human activities, including deforestation, removal of riparian vegetation, and the presence of recreational bathing areas lacking adequate sanitary infrastructure. These factors have affected the physical, chemical, and bacteriological characteristics of the water, and paddlers should be aware of potential contamination risks.

The area around the reservoir has some recreational and tourist activity, particularly in the district of Ipaguaçu Mirim, which is noted as a tourist route within Massapê. The reservoir draws visitors during overflow events. However, no specific paddling access points, designated launch sites, paddling routes, or facilities for paddlers have been established. Paddlers planning a visit should verify local conditions and any applicable regulations with municipal authorities in Massapê before launching.