Açude Ubaldinho is a reservoir completed in 1999 with a storage capacity of 32,000,000 cubic meters. It sits within the Bacia do Salgado, straddling the boundary between the municipalities of Várzea Alegre and Cedro in the southern region of Ceará. The reservoir is fed by the Riacho São Miguel and serves as the primary potable water supply for the city of Cedro. The surrounding area is known locally as the Vale do São Miguel.

The main access route is via highway CE-284, the Cedro–Umarizeira road. The reservoir operates without restricted hours, remaining accessible around the clock. Along its shores there is an established balneário (bathing and recreation area) that draws visitors from across the southern Ceará region, making it one of the more frequented leisure destinations in that part of the state. A fishing colony is also present on site, indicating an active artisanal fishing community on the water.

Water levels fluctuate considerably with seasonal rainfall. The reservoir's surface elevation reaches approximately 293 meters above sea level during periods of good inflow, with notable rises recorded during the February rainy season. Paddlers should be aware that water levels and the extent of navigable surface area will vary depending on the time of year and recent precipitation patterns, which is typical of semi-arid northeastern Brazil reservoirs.

The reservoir functions primarily as a municipal water supply source, so paddlers should be mindful of that designation and any local regulations that may apply to activities on the water. The presence of the fishing colony and the recreational bathing area means the shoreline sees regular human activity, particularly at the balneário. The CE-284 highway provides the primary land access to the reservoir's vicinity.