| Água Longa | |
|---|---|
| — Parish — | |
| Country | Portugal |
| Municipality | Santo Tirso |
| Area | |
| • Total | 14.9 km2 (5.8 sq mi) |
| Population (2001) | |
| • Total | 2,134 |
| • Density | 143.2/km2 (370.9/sq mi) |
| Website | none |
Água Longa (Portuguese meaning "long water") is a Portuguese parish, located in the municipality of Santo Tirso. It has a population of 2,134 inhabitants and a total area of 14.9 km².