The flag of the Argentinian province of Tucamán consists of a horizontal triband of white, blue, and white. The colors are the same as that or the national flag of Argentina, which also uses a horizontal triband, but its colors are reversed compared to that of flag of Argentina. A similar flag was first used in 1812 during the Argentine War of Independence, but the current flag was officially adopted on April 13th, 2010.
See this flag and more in Flagsplosion, an endless flag identifying quizzer on Steam. Now available!