Maranhao
| Dam Name | Maranhao |
| River | Seda |
| Near City | Portalegre |
| Administration City | Evora |
| Country | Portugal |
| Year | 1957 |
| Dam Height | 55 |
| Dam Length | 204 |
| Area(Sqkm) | 5.5 |
| Area(Polygonal) | 5.5 |
| Capital Expenditure | 205.4 |
| Depth(M) | 37.3 |
| Avg Displacement Of Water | 16152 |
| Catchment Area In Sqkm | 2298 |
| Main Usage | Irrigation |
| Status | 3: Fair |
| Longitude | -7.975417 |
| Latitude | 39.020417 |
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