Which country's flag has an aspect ratio of 28:37?

Denmark's flag, the Dannebrog, is commonly given an aspect ratio of 28:37.

That unusual proportion comes from the flag's construction rules rather than from a simple rectangular standard such as 2:3. The Dannebrog is a red Nordic Cross flag: the white cross reaches the edges, and its vertical arm is shifted toward the hoist. The inner red fields nearest the pole are square, while the outer fields are longer, producing the distinctive 28:37 figure.

The cross design has been associated with Danish kings since at least the fourteenth century. A famous national legend says the flag fell from the sky during the Battle of Lindanise in Estonia on 15 June 1219, but historians treat that origin story cautiously. The flag was formally recognised as Denmark's national flag in 1625.

The ratio can cause confusion because Danish regulations and historical practice have allowed related proportions, including the older 28:34 form. The swallow-tailed naval flag also has different proportions. Nevertheless, 28:37 is the standard ratio commonly listed for the rectangular national Dannebrog, making Denmark the canonical quiz answer.