Greenland, perhaps.
Liechtenstein's flag is blue in the top half and red in the bottom half. There is also a yellow/gold crown in the blue part.
By the sounds of it, if the black is on top and red on bottom, it is the Australian sub-national flag of the Aboriginal Peoples'.
The half red half white flag with a moon and stars is the national flag of Turkey. It holds great significance as a symbol of the country's history, culture, and identity. The red represents the blood shed by those who fought for the nation, while the white symbolizes peace and purity. The moon and stars are a reference to the country's connection to the Ottoman Empire and its Islamic heritage. Overall, the flag is a powerful emblem of Turkish pride and unity.
A country whose flag has the colours green, white and red
The colours of the Polish flag are red and white. The flag is half red and half white, divided horizontally. In the top half, which is white, there is a red crest with a white bird in it.
The flag with white and red stripes is the flag of Poland.
The flag is divided horizontally into two. The top half is white and the bottom half is red.
The flag of which country features white, green, and black colors is the flag of Libya.
half of it
Japan's flag is white with a red dot in the center.
Half-staffing a flag to represent mourning is an international custom.