Açude Jenipapeiro, commonly known as Açude Buiú, is a public reservoir located in the municipality of Olho d'Água, in the state of Paraíba, Brazil. It is owned and operated by the state government and serves the dual purposes of water supply and irrigation for the surrounding region.

With a total storage capacity of approximately 70,757,250 cubic meters, it is classified as a medium-sized reservoir under the criteria established by Paraíba's water management agency, the Agência Executiva de Gestão das Águas (AESA). By volume, it ranks as the eighth largest reservoir operated by AESA and the ninth largest in Paraíba overall, making it the principal water body of the municipality of Olho d'Água.

Given its scale and classification as a medium-sized impoundment in the semi-arid interior of Paraíba, paddlers should be aware that water levels can fluctuate considerably depending on seasonal rainfall patterns typical of the northeastern Brazilian sertão. The region experiences a pronounced dry season, and reservoir levels may vary significantly between wetter and drier periods of the year, which can affect access and navigable area.

Paddlers planning a visit should contact local authorities or the AESA directly for up-to-date information on water levels, access conditions, paddling access points, established routes, facilities, and any applicable restrictions before undertaking a trip.