The N-121 is a highway in

Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , i ...

. It starts north of

Tudela Tudela may refer to: *Tudela, Navarre, a town and municipality in northern Spain ** Benjamin of Tudela Medieval Jewish traveller ** William of Tudela, Medieval troubadour who wrote the first part of the ''Song of the Albigensian Crusade'' ** Battl ...

with a junction on N-113 and

Autovía A-15 The Autovía A-15 is a highway in Spain from Tudela to San Sebastián. The road sets off in the N-I from Andoain, south of San Sebastián. It heads south east by the Aralar Range crossing the green mountainous region of north-eastern Navarre pa ...

. The road crosses the Las Bárdenas Reales and the Alto de Masadas to

Tafalla Tafalla is a town and municipality located in the province and autonomous community of Navarre, northern Spain. The Postal code is 31300. Tafalla is an industrial and agricultural town. It produces beef, mutton, pork and chicken. History Pr ...

. It passes the Puerto del Carrascal (594m) and then down into

Pamplona Pamplona (; eu, Iruña or ), historically also known as Pampeluna in English, is the capital city of the Chartered Community of Navarre, in Spain. It is also the third-largest city in the greater Basque cultural region. Lying at near above ...

. It has junctions with N-240,

N-111 The N-111 is a highway in Spain. It connects Pamplona with Madrid. It commences at Pamplona with a junction on the Autovía A-15 (junction 88km). It heads south west to Logroño in the Ebro valley crossing the Sierra de Izco by the Puerto de ...

and N-135. The N-121 heads north over the Puerto de Belate (847m). The road then splits in two the eastern branch following the Valle del Baztan and into

France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...

by the Puerto de Otxondo (602m). The western branch turns west below the Parqu Nacional de Bertiz. It then turns north up the valley of the Rio Bidasoa to

Irun Irun ( es, Irún, eu, Irun) is a town of the Bidasoaldea region in the province of Gipuzkoa in the Basque Country (autonomous community), Basque Autonomous Community, Spain. History It lies on the foundations of the ancient Oiasso, cited as ...

and the

Autopista AP-8 The Autopista AP-8 is a highway ( autopista) in the north of Spain and crosses the Basque Country from east to west. It is known as the Autopista del Cantábrico (highway of the Cantabrian) and connects the French border with Bilbao. This tol ...

References

{{reflist National roads in Spain Roads in the Basque Country (autonomous community) Transport in Navarre