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The flag of Saint Lucia consists of a cerulean blue field charged with a yellow triangle in front of a white-edged black isosceles triangle. Adopted in 1967 to replace the British Blue Ensign defaced with the arms of the colony, it has been the flag of Saint Lucia since the country became an associated state of the United Kingdom that year. Although the overall design of the flag has remained unchanged, specific aspects of it have been altered over the years.

Source: Wikipedia