The Nivelle (widest accepted Basque forms: Ugarana or Urdazuri) is a 41 km long river in the Northern Basque Country (France) flowing largely south-east to north-west, with only 7 km of its length being considered navigable. The river results from the union of various streams in Urdazubi (Navarre), going on to cross the Spanish-French border at Dantxarinea after 14 km meandering across Navarrese soil. The river pours into the Bay of Biscay on the bay of Saint-Jean-de-Luz (French for Donibane Lohizune) after cutting its way between this town and Ciboure (French for Ziburu) on its final stage.