View of the inside of the stadium as seen from the south goal.
The name is called after a river near to the stadium., "El Sadar" was also named from 1967 to 2005 and since 2011 again. From 2005 to 2011 the stadium was called Reyno de Navarra after the sponsor of Government of Navarre, the name used the medieval Spanish word reyno instead of the modern reino ("kingdom", derived from rey, "king") which lends it a somehow archaic touch.
Opened in 1967 as El Sadar, the stadium replaced the San Juan stadium that was sold the previous year. The stadium accommodated a capacity of 25,000 spectators at its opening with only 7,000 of those seated. Its inaugural game was played on 2 September between Zaragoza and Portuguese side Vitoria de Setúbal and ended in a one-all draw. The following day Osasuna defeated Vitoria de Setúbal 3-0 for its first win in the new stadium. Osaba scored the first goal for Osasuna in El Sadar in the 28th minute.