Açude Pirabibu is a reservoir located in the District of Damião Carneiro, within the municipality of Quixeramobim in the state of Ceará, Brazil. Situated approximately 26 kilometers from the center of Quixeramobim, this açude lies within the Sub-Bacia Hidrográfica do Rio Banabuiu — a sub-watershed that encompasses thirteen municipalities in the semi-arid interior of Ceará. Like many reservoirs in the Ceará sertão, Pirabibu serves primarily as a source of human water supply, while also supporting local fishing activity along its banks. The surrounding landscape reflects the broader challenges of the region, where the caatinga biome meets a semi-arid climate, and where water bodies like this one are vital community resources.