Açude Forquilha is a large inland reservoir located entirely within the municipality of Forquilha in the northern region of Ceará, approximately 220 kilometers from Fortaleza. It sits within the drainage basin of the Rio Acaraú and has a storage capacity exceeding 50 million cubic meters, making it the largest hydraulic infrastructure in the Zona Norte of Ceará.

The reservoir is impounded by two homogeneous earthen dams. The main dam is notable for having the BR-222 federal highway running directly across its crest, which serves as a practical landmark for orientation. The auxiliary dam is positioned perpendicularly to the main structure. Construction began in 1919 and was completed in 1928, with the construction dates still visible on the upstream face of the main dam.

The reservoir is actively used for pisciculture, and fishing boats are commonly found moored along the margins. This working character means paddlers can expect to share the water with fishing activity. The surrounding landscape reflects the semi-arid conditions typical of the region, and the margins have been affected by deforestation, erosion, and sedimentation over the decades.

Water quality is a concern. Contamination from inadequate sanitation infrastructure in the surrounding communities, as well as runoff associated with erosion and deforestation of the watershed, affect the reservoir. Paddlers should be aware of these conditions when considering contact with the water.

The reservoir fills infrequently and has overflowed only a handful of times in its history, with recorded spill events in 1939, 1940, and 1950. Water levels can vary considerably depending on rainfall patterns in the semi-arid region, which should be factored into trip planning, particularly regarding access to launch points along the margins.