The Cadagua or Kadagua River drains the

Biscay Biscay (; eu, Bizkaia ; es, Vizcaya ) is a province of Spain and a historical territory of the Basque Country, heir of the ancient Lordship of Biscay, lying on the south shore of the eponymous bay. The capital and largest city is Bilbao. B ...

an area of Encartaciones (), from the Castilian valley of

Mena MENA, an acronym in the English language, refers to a grouping of countries situated in and around the Middle East and North Africa. It is also known as WANA, SWANA, or NAWA, which alternatively refers to the Middle East as Western Asia (or a ...

Barakaldo Barakaldo ( es, Baracaldo; eu, Barakaldo ) is a municipality located in the Biscay province in the Basque Country. Located on the Left Bank of the Estuary of Bilbao, the city is part of Greater Bilbao, has a population at 100,881. Barakaldo h ...

and

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, where it forms the border between these municipalities and ends at the

Estuary of Bilbao The Estuary of Bilbao (Spanish: ''Ría de Bilbao'' / Basque: ''Bilboko Itsasadarra'') lies at the common mouth of the rivers Nervion, Ibaizabal and Cadagua, which drain most of Biscay and part of Alava in the Basque Country, Spain. In this inst ...

. Another important town that this river crosses is Balmaseda. The river takes its name from the small village where is located its first spring. Cadagua village is located in Valle de Mena (Burgos, Spain) surrounded by the beautiful landscape of "La Peña" mountains. Four small hydropower plans produce electricity thanks to the river Cadagua. Until the last decades of the 20th century, this water power was also used by several mills that can be nowadays seen by the river basin. Cadagua is a company which takes its name from this river. This company designs, plans and builds water treatment plants in order to improve the environment.

See also