Dão River

Dão (Portuguese pronunciation: [dɐ̃w]) is a Portuguese river that originates in the plateau regions of Trancoso-Aguiar da Beira in the Eirado parish, Aguiar da Beira Municipality, Guarda District, and varies between 714 and 757 metres (2,343 and 2,484 ft) in elevation.^[1][2]

Dão river
Native name	Rio Dão (Portuguese)
Physical characteristics
Source	Eirado
• location	Aguiar da Beira
• coordinates	40°47'09.4"N 7°29'52.2"W
• elevation	750 m
Mouth	Mondego River
• location	Foz do Dão, Santa Comba Dão
• coordinates	40°20'27.4"N 8°10'51.2"W
• elevation	110 - 124,7 m
Basin size	1377 km2
Basin features
Tributaries
• left	Carapito stream
• right	Coja stream, Sátão River, Criz River

It flows in a general northeast–southwest direction, passing through Barragem de Fagilde and crosses or demarcates the limits of the councils of Aguiar da Beira, Penalva do Castelo, Mangualde, Viseu, Carregal do Sal, Nelas, Tondela, and Santa Comba Dão. It empties into the Mondego River, in the limits of the councils of Santa Comba Dão, Mortágua, and Penacova, after covering about 100 kilometres (62 mi).

Its granite-sloped valley is situated in the "Região Demarcada do Dão", where the Vinho do Dão wines are produced.^[3]

Low water level in Dão river

Dão River at Santa Comba Dão