Represa de Sobradinho, also known as Lago de Sobradinho, is one of the largest artificial lakes in the world and the largest in Brazil, with a surface area of approximately 4,214 km² and a length of roughly 320 km. It was formed by the damming of the Rio São Francisco, the longest river entirely within Brazil at 2,914 km, and sits in the semi-arid north of Bahia state at a nominal elevation of 392.5 m. The reservoir has a total storage capacity of 34.1 km³, ranking it 15th largest in the world by that measure. Construction took place between 1973 and 1979, and the dam has been in commercial operation since 1979.

The sheer scale of the reservoir defines the paddling experience here. At over 300 km in length, the lake offers vast open water with considerable fetch, meaning wind-driven waves and exposure are real factors to account for when planning any trip. The surrounding landscape is characteristic of the northeastern Brazilian sertão — semi-arid terrain with sparse vegetation — giving the water a wide, open quality under intense sun.

Kayak fishing is an established activity on the lake. A catch-and-release sport fishing event has been held at the locality of Algodões, in the municipality of Sobradinho, with participants using both kayaks and motorized vessels. Tilapia is among the fish species present, and local fishermen sell fresh catch near the dam area. The nearest major city is Juazeiro, Bahia, located approximately 50 km from the dam, and the dam itself is accessible by car via BA-316. A viewpoint (mirante) above the dam structure is accessible during daylight hours and requires no entrance fee.

Water levels in the reservoir are subject to significant variation, and low water levels can be a concern for visitors. Given the reservoir's role in regulating flows for downstream hydropower plants throughout the Rio São Francisco basin, operational management influences lake levels over time. Paddlers should factor in the reservoir's size and semi-arid climate — with high temperatures and strong sun year-round — when planning any extended trip on the water.