Which river rises in the Massif Centrale, flows north and east to enter the Bay of Biscay at St. Nazaire?
Bay of Biscay the limits of the Bay of Biscay as "a line joining Cap Ortegal () to Penmarch Point ()". The southernmost portion is the Cantabrian Sea. The main rivers that empty into the Bay of Biscay are Loire, Charente, Garonne, Dordogne, Adour, Nivelle, Bidasoa, Oiartzun, Urumea, Oria, Urola, Deba, Artibai, Lea, Oka, Nervión, Agüera, Asón, Miera, Pas, Saja, Nansa, Deva, Sella, Nalón, Navia, Esva, Eo, Landro and Sor. In late spring and early summer a large fog triangle fills the southwestern half of the bay, covering just a few kilometers inland. As winter begins, weather becomes severe. Depressions enter from the
Oiartzun (river) Oiartzun (river) The Oiartzun River () is a short river in the Basque Country in the north of the Iberian Peninsula. It is the smallest river of Gipuzkoa flowing into the Bay of Biscay (Atlantic basin); the river joins the sea at the Bay of Pasaia. The Oiartzun rises in the Aiako Harria massif at an altitude higher than 700 m. It flows down through steep slopes and falls, with an average drop to its mouth of 5.49% (600 m drop in the first 5 km). The river meanders through the valley and several hamlets of the town of the