Roman dam of Belas
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The Roman dam of Belas
Belas
Diellas is a village in the Mala Prespa, Albania, District Pustec, Korçë District....

 (III century AD) may have served the city of Olisipo
Olisipo
Municipium Cives Romanorum Felicitas Julia Olisipo was the ancient name of modern day Lisbon while part of the Roman Empire....

 or a local roman villa (Roman villa of Quinta da Bolacha
Roman villa of Quinta da Bolacha
Roman villa in Quinta da Bolacha, Amadora, Portugal, with occupation from the third to fourt century AD .It is associated with a nearby roman aqueduct, agriculture and Chalcedony mining....

).

Some 10 km from the city center, the aqueduct starts with a roman build brick dam in the Carenque river.

The dam is still visible today (length of 15,5m, 7 m wide and 8 m high). The capacity of the dam was 125.000 m3.
Its channel can be followed over some 1300 m but then it's course is lost due to the much modern Águas Livres Aqueduct
Águas Livres Aqueduct
The Águas Livres Aqueduct is a historic aqueduct in the city of Lisbon, Portugal. It is one of the most remarkable examples of 18th-century Portuguese engineering...

that was built over the old structures.
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