| São Marcos River | |
|---|---|
| Country | Brazil |
| Physical characteristics | |
| Main source | Goiás state |
| River mouth | Paranaíba River |
The São Marcos River (Portuguese, Rio São Marcos) is a river of Goiás state in central Brazil. It is a tributary of the Paranaíba River, which it joins in the reservoir created by Emborcação Dam.
Coordinates: 18°14′44″S 47°36′44″W / 18.24556°S 47.61222°W