Rio Parnaíba
| Rio Parnaíba | ||
 The Rio Parnaíba near Nazária |
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| Data | ||
| location | Maranhão and Piauí , Brazil | |
| River system | Rio Parnaíba | |
| Source height | 700 m | |
| muzzle |
Atlantic Ocean near the city of Parnaíba Coordinates: 2 ° 44 ′ 41 ″ S , 41 ° 47 ′ 37 ″ W 2 ° 44 ′ 41 ″ S , 41 ° 47 ′ 37 ″ W |
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| Mouth height | 0 m | |
| Height difference | 700 m | |
| Bottom slope | 0.41 ‰ | |
| length | 1716 km | |
| Catchment area | 322,823 km² | |
| Reservoirs flowed through | Boa Esperança Reservoir | |
The Rio Parnaíba is a river in northeastern Brazil , which almost in its entire course forms the border between the states of Maranhão and Piauí . It rises at an altitude of 700 meters in the Brazilian mountains in the Chapada das Mangabeiras mountain range , which has been in the Nascentes do Rio Parnaíba National Park since 2002 , and flows 1716 km northeast into the Atlantic Ocean . There are waterfalls in the middle and upper part of the river, but it is navigable up to the mouth of the Rio Canindé . The river delta , Delta do Parnaíba, is located in Piauí and is said to be the third largest river delta in the world. There is the city of Parnaíba with a port.
The slope of the river from the source to the small town of Santa Filomena (270 m) is of medium size, after which it is between 35 cm / km and 17 cm / km.
At Guadalupe , the Parnaíba is dammed up to form the Boa Esperança reservoir .
The catchment area is 322,823 km².
There are many piranhas in the river .
