Sado I 13005 335.92
The only deep indentations of the Portuguese littoral are the lagoon of Aveiro and the estuaries of the Minho, Douro, Mondego, Tagus, Sado and Guadiana, in which are the principal harbours.
The lagoon of Aveiro, the estuary of the Sado and the broad inland lake formed by the Tagus above Lisbon, recall the waterways of Holland.
Ossa (2129 ft.), Caixeiro (1483 ft.), Monfurado (1378 ft.) and Mendro (1332 ft.) form the high ground between the rivers Sado, Sorraia and Guadiana.
Between the Tagus and Cape St Vincent the principal rivers are the Sado, which is formed by the junction of several lesser streams and flows north-west to the port of Setubal; and the Mira, which takes a similar direction from its headwaters south of Monte Vigia to the port of Villa Nova de Milfontes.