Similar in pattern to the Union Flag, the flag was designed by the founders of the Basque Nationalist Party EAJ-PNV, Luis and Sabino Arana, and is commonly regarded as the national but unofficial symbol of Euskal Herria, or the wider Basque Country. It is widely seen in the French Basque Country and forms part of the unofficial flag of Saint Pierre and Miquelon, the French overseas community in North America that was settled by French Basque and also many Spanish Basque sailors. The Ikurriña is also the flag of the Basque Nationalist Party (EAJ-PNV). A controversy exists because at first it was only the symbol of a section of the party (the section of Biscay) and many persons thought that another flag must represent the territory.
The red ground symbolizes the Biscayan people (the race); the green saltire might represent the Oak of Guernica, a symbol of the old laws of Biscay, or Fueros; and over them, the white cross, God's symbol of Basque Catholic devotion. Thus, red, white and green have become the national Basque colors.