The top stripe on Colombia’s national flag is yellow.
Colombia’s flag is a horizontal yellow-blue-red tricolor, with the yellow band twice as tall as either the blue or red band. The arrangement was formally adopted in its modern form on November 26, 1861, after earlier versions were used by Gran Colombia and the Republic of New Granada.
The colors connect Colombia to Ecuador and Venezuela, whose flags share roots in the revolutionary tricolor associated with Francisco de Miranda and Gran Colombia. This shared history is why the three flags can look similar at a glance, although their stripe proportions and emblems differ.
A common mistake is assuming all three stripes are equal. Colombia’s yellow stripe occupies the upper half of the flag, while blue and red each occupy one quarter. Ecuador uses a similar unequal layout, whereas Venezuela’s modern flag has three equal horizontal stripes and stars.