| Aljezur River | |
| Name Other: | Amoreira River |
| Pushpin Map: | Portugal topographic |
| Pushpin Map Caption: | Aljezur River at Aljezur |
| Subdivision Type1: | Country |
| Subdivision Name1: | Portugal |
| Subdivision Type3: | Region |
| Subdivision Name3: | Algarve |
| Subdivision Type4: | District |
| Subdivision Name4: | Faro |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Aljezur |
| Source1 Location: | Aljezur (parish) |
| Source1 Coordinates: | 37.3166°N -8.8032°W |
| Mouth: | The west coast of the Algarve into the Atlantic at Praia da Amoreira |
The Aljezur River (pronounced as /pt/) is a small river in the Portuguese region of the Algarve. The river runs westwards for 6.1miles from its start in the village of Aljezur from the confluence of the River Alfambres and River Cerca[1] [2] to its mouth on the Atlantic western Algarve coast at Praia da Amoreira.
From its confluence the river loops through a ravine around the base of a hill on which is the ruins of the Morrish castle of Aljezur (Portuguese: Castelo de Aljezur). The Moors constructed a port at the base of the castle and made the river navigable out to the ocean at Amoreira. The river and port remained navigable until the 18th century after which channel fell into a state of disrepair following the destruction of the village caused by the 1755 earthquake.
From Aljezur the river meanders through a narrow valley which is within the Vicentine Coast Natural Park at the seaward end the river opens up to a narrow marshland estuary.[3] This habitat supports such creatures as kingfishers, marsh warblers, grey herons and otters.