| Alte River | |
| Pushpin Map: | Portugal topographic |
| Pushpin Map Caption: | Confluence of the Alte River and the Quarteira River |
| Subdivision Type1: | Country |
| Subdivision Name1: | Portugal |
| Subdivision Type3: | Region |
| Subdivision Name3: | Algarve |
| Subdivision Type4: | District |
| Subdivision Name4: | Faro |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Loulé |
| Length: | 7.2miles, North East to South West |
| Source1 Location: | Alte, Algarve |
| Source1 Coordinates: | 37.2383°N -8.166°W |
| Source Confluence Location: | Quarteira River |
| Source Confluence Coordinates: | 37.181°N 8.2078°W |
| Source Confluence Elevation: | 50m (160feet) |
| Mouth: | Into the Atlantic Ocean at Quarteira |
The Alte River (pronounced as /pt/) is a small river in the Portuguese region of the Algarve.[1] The river along with the Algibre River, another tributary, becomes the Quarteira River after the two rivers conflux. The source[2] of the river is a short distance east of the village of Alte and it runs for a distance of 7.2miles to its confluence with the Algibre River near the village of Paderne.
The Algibre is one of a number of small rivers in the central Algarve which make up the water ecosystem known as the Querença–Silves Aquifer System.[3]