Chad

The national flag of the Republic of Chad is a vertical tricolor consisting (left to right) of a blue, a yellow and a red field. Blue was substituted for green to avoid confusion with Mali. The basic design is the same as that of the flag of Romania, and the flag of Andorra. The only divergence from the flag of Romania is different variations of blue on the left strip, so both national flags look virtually identical. [Flag of Chad. Wikipedia]