After the many fatal accidents in the N121-A, they decided to construct new road tunnels, which made to be used part of the old N121-A and bike path. The layout is easy, and very nice. Party from Béhobie (Guipúzcoa), to reach the province of Navarra. The asphalt is made out of pebble, and passes along the river Bidasoa. Along the way there are a few picnic areas, and for the more adventurous you can go down to the river to bathe. This river is a place where you can practice canoe, and fishing. The landscape is typical of northern Navarra, with that bright green.