Tres Marias Reservoir
General data
- Name: Tres Marias Reservoir
- Water system: Sao Francisco River
- Water type: Artificial lake
- Progression: Sao Francisco River -> Atlantic Ocean -> Planet Earth
- Climates: Tropical, Subtropical
- Continents: South America
- Countries: Brazil
The Tres Marias Reservoir is formed by the Três Marias Dam (Usina Hidrelétrica de Três Marias, “Bernardo Mascarenhas”) on the São Francisco River, in the state of Minas Gerais.