Açude Edson Queiroz, also known as Açude do Serrote, is a large reservoir located in the municipality of Santa Quitéria, in the state of Ceará, approximately 250 kilometers from the state capital, Fortaleza. It sits in the semi-arid northeastern region of Brazil, built across the Groaíras River, a tributary of the Acaraú River. Construction was completed in 1987 by DNOCS (Departamento Nacional de Obras Contra as Secas) through the contractor Andrade Gutierrez S/A, and the dam is of earthfill and rockfill construction. The reservoir has a storage capacity of approximately 254 million cubic meters and a surface area of 26.60 km², making it one of the largest reservoirs built by DNOCS in Ceará.

Access to the reservoir is via the CE-032 highway to Santa Quitéria, from which a 16-kilometer road constructed by DNOCS leads to the dam site. The surrounding area supports agriculture, aquaculture, and recreational use, and two communities — São Cosme and São Damião — have developed in the vicinity of the reservoir.

The water exhibits relatively low salinity by regional standards, with a maximum electrical conductivity of 460 μS/cm recorded during one study period. However, the reservoir exhibits strong thermal stratification during and after the rainy season, typically persisting for approximately five months. This stratification is driven by cooler recharge waters submerging beneath warmer stored water, and is reinforced by weak winds and reduced daily temperature variation during the wet season. Paddlers should be aware that water quality and thermal conditions vary considerably between the wet and dry seasons.

The reservoir supports a diverse fish assemblage, including both native and introduced species, and fishing activity is present in the area. The broader landscape is characteristic of the semi-arid Caatinga biome of northeastern Brazil. The reservoir has historically attracted visitors for leisure activities, including swimming, and drew large crowds when it overflowed in April 2024 for the first time in thirteen years — an indication of how variable water levels can be in this drought-prone region. Paddlers planning a visit should verify current water levels in advance, as the reservoir can experience significant drawdown during extended dry periods.