Alviela River
| Alviela | |
|---|---|
 | |
 | |
| Physical characteristics | |
| Source | |
| • location | Olhos d’Água do Alviela, Alcanena |
| • elevation | 135 m (443 ft) |
| Mouth | Tagus |
• location | near Vale de Figueira[2] |
• elevation | 23 m (75 ft) |
| Length | 51.16 km (31.79 mi) |
| Basin size | 180 km2 (69 sq mi)[1]-331 km2 (128 sq mi)[2] |
| Discharge | |
| • maximum | 17 m3/s (600 cu ft/s)[1] |
| Basin features | |
| Tributaries | Ribeira dos Amiais, Ribeira de Carvalhos, Ribeira da Gouxaria |
| Tagus Basin | |
Alviela River (Template:Lang-pt, Portuguese pronunciation: [aɫviˈɛlɐ]) is a river in Portugal. It is 51.16 kilometres (31.79 mi) long.[3] The Alviela spring is one of the deepest in the world and is locally connected to a cave complex that represents the most significant fluvio-karstic phenomena in Portugal, one which supports several bat colonies with more than 5,000 bats in total.[4]
The river has its origin in a karst spring. Ribeira dos Amiais, a losing stream, infiltrates through the Sumidouro da Ribeira dos Amiais, a ponor, only to return to the surface 250 m further on through a canyon.[5]
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Ribeira dos Amiais, tributary of Alviela
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Sumidouro da ribeira dos Amiais, were the water from the stream infiltrates
References
- ^ a b "Nascente dos Olhos de Água do Alviela, Alcanena". www.roteirodeminas.pt (in Portuguese). Retrieved 21 May 2021.
- ^ a b "Conhecer o Rio Alviela" (PDF). Retrieved 22 May 2021.
- ^ "Rio Alviela". snirh.inag.pt (in Portuguese). Archived from the original on 2012-01-26. Retrieved 2012-09-22.
- ^ "Mira Minde Polje and related Springs | Ramsar Sites Information Service". rsis.ramsar.org. Retrieved 21 May 2021.
- ^ "Ribeira dos Amiais, um trilho pela perda e ressurgência do PNSAC". Viajar entre Viagens (in European Portuguese). 2020-04-15. Retrieved 22 May 2021.