Its length, from the east in the mountain range of Campanquiz to the mouth is approximately 150 kilometers.

An area of 363.48 km2 (140.34 sq mi) of the Nieva River watershed was declared a reserved zone.

The Nieva River Reserved Zone is located in the Yambrasbamba District of the Bongara Province.

Its aim is to conserve the high biodiversity of the Nieva River watershed and to provide the local people, especially the Awajún communities, with good drinking water.

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