But that's not good enough for thousands of people who want complete independence.
The organisers say it reached 202km (125 miles) and linked the cities of San Sebastian and Bilbao with Vitoria, the seat of the Basque parliament.
Support for outright Basque independence has fallen over the years.
It was organised by the Guru Esku Dago (In Our Own Hands) group as a peaceful call to the Spanish government to allow a vote on independence.
The Basque Country is one of Spain's most autonomous communites, with its own language and culture.
The event was also created to show support for Catalonia several of whose pro-independence leaders were jailed or else fled overseas in the aftermath of last year's referendum which Madrid said was unconstitutional.
Pro-independence forces in the Basque region are jockeying for greater influence now that armed Basque separatist group ETA, which killed more than 800 people in a five-decade campaign of violence, announced it was disbanding on May 3.
The courts have since detained politicians involved in the independence drive based on the constitutional clause that Spain is indivisible as a country.
While polls suggest that a vast majority of Basque people do not support full independence (only around 15 percent back total secession from Madrid), many nevertheless believe that the people should have the right to vote on the issue.
Microsoft Reveals HALO: INFINITE With Surprise Trailer at E3
The trailer showed some beasts akin to prehistoric rhinos, soldiers, and Master Chief holding his helmet (no head shown, though). On stage, Phil Spencer said the game will see players joining Master Chief "on his greatest adventure yet to save humanity".
Jackson Odell, ‘The Goldbergs’ Actor, Dies at 20
His family released a statement which reads: "The Odell family has lost our beloved son and brother, Jackson Odell ". Former teen actor and successful songwriter Jackson Odell has died, according to media reports.
Online Sports Betting Market Growth
Benefits With the market high, sports betting is an activity that receives a high level of support from online betting companies. More betters are opting to forego the long lines at the cashier's counter and the unavailability of their favorite machines.