| Trancão | |
| Mouth Location: | Tagus |
| Subdivision Type1: | Country |
| Subdivision Name1: | Portugal |
| Basin Size: | 29.319km2 |
| Extra: | Tagus Basin |
The Trancão River (pronounced as /pt/), formerly called Rio de Sacavém, is a small river in Portugal (about 29 km) from District of Lisbon. Near its mouth, this watercourse can also be called Ribeira de Sacavém ou Vala de Sacavém.Web site: Ribeira ou Vala de Sacavém . 30 May 2012 . C.M. Loures . https://web.archive.org/web/20120629053050/http://www.cm-loures.pt/aa_Ambiente_RN.asp . 2012-06-29.