Which European country's flag consists of a blue field with a yellow triangle and a row of white stars?

Bosnia and Herzegovina’s flag is a blue field crossed by a yellow triangle and lined with white stars. Along the triangle’s sloping edge are seven full five-pointed stars and two half-stars, one at each end.

The flag was adopted on 4 February 1998, after Bosnia and Herzegovina’s post-war government failed to settle on a design acceptable to all major political groups. The flag was proclaimed by the international High Representative Carlos Westendorp. Its blue-and-yellow palette also gives it a visual connection with Europe, while avoiding symbols identified exclusively with one ethnic community.

The triangle is often interpreted as representing the country’s three constituent peoples—Bosniaks, Croats, and Serbs—and its shape roughly echoes Bosnia and Herzegovina’s territory. The stars form a continuous line, suggesting Europe and continuity; the partial stars at the edges make the row appear endless beyond the flag.

Serbia, Slovenia, and Croatia are easy regional alternatives, but each uses a coat of arms or shield. Bosnia and Herzegovina is the only one of these four choices with the distinctive diagonal triangle-and-stars design.