The flag of the Dominican Republic has a white cross dividing it into four rectangles. The top left and bottom right rectangles are blue (#002D62), while the top right and bottom left rectangles are red (#CE1126). In the center, there's a white square with the national coat of arms.

The aspect ratio of the flag is 2:3, meaning its width is two units long and its height is three units long. The white cross is one-fifth the width of the flag. The central white square containing the coat of arms has sides equal to half the height of the flag.

In summary:

• Colors: Blue (#002D62), Red (#CE1126), White
• Aspect ratio: 2:3
• Cross width: 1/5 of flag width
• Central square side length: 1/2 of flag height