The river Sado () is a

river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of ...

in southern

Portugal Portugal, officially the Portuguese Republic ( pt, República Portuguesa, links=yes ), is a country whose mainland is located on the Iberian Peninsula of Southwestern Europe, and whose territory also includes the Atlantic archipelagos of th ...

; it is one of the major rivers in the country. It flows in a northerly direction (the only major Portuguese river to do so) through from its springs in the hills of Ourique before entering the

Atlantic Ocean The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe ...

in an

estuary An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environm ...

in the city of

Setúbal Setúbal (, , ; cel-x-proto, Caetobrix) is a city and a municipality in Portugal. The population in 2014 was 118,166, occupying an area of . The city itself had 89,303 inhabitants in 2001. It lies within the Lisbon metropolitan area. In the t ...

. The estuary is the habitat of a large community of

bottlenose dolphin Bottlenose dolphins are aquatic mammals in the genus ''Tursiops.'' They are common, cosmopolitan members of the family Delphinidae, the family of oceanic dolphins. Molecular studies show the genus definitively contains two species: the comm ...

s; there are 31 members of the pod, each of whom has been named (2007). The river is dammed in several places, chiefly for irrigation of rice, maize, and other vegetables. In its course, the river crosses the city of

Alcácer do Sal Alcácer do Sal () is a municipality in Portugal, located in Setúbal District. The population in 2011 was 13,046, in an area of 1499.87 km2. History Earliest settlement There has been human settlement in the area for more than 40,000 y ...

References

Rivers of Portugal {{Portugal-river-stub