Saint Lucia's flag is a portrait of two mountains. The triangles at its center are the Pitons, Gros Piton and Petit Piton, the volcanic peaks that are the island's most recognizable feature.
Dunstan St Omer's design
The flag was adopted on March 1, 1967, when Saint Lucia became an associated state of the United Kingdom, a step toward the full independence it reached in 1979. The Saint Lucian artist Dunstan St Omer designed it, and the country kept it unchanged through independence. The adjustments since have been small, mostly to the shade of blue and to the size and placement of the triangles.
Reading it
The field is cerulean blue, for the Caribbean Sea around the island and for fidelity. At the center a gold isosceles triangle sits beneath a smaller black triangle edged in white.
Gold is sunshine and prosperity. The black and white triangle stands for the relationship between the island's black and white populations, with the white edging read as purity and the aspirations of the people. Together the triangles make the Pitons.
Few national flags depict a specific piece of landscape rather than an abstraction, which is a large part of why this one is hard to confuse with anything else in the region.
In use
The flag is the national standard and flies at government buildings and official events, with protocol covering handling and display. Variants exist for particular state functions, including naval ensigns. It is central to national holidays, festivals, and public celebrations.
Among Caribbean flags
Saint Lucia shares some symbolic colors with other former British colonies in the region. What it does not share is the subject matter: most Caribbean flags reach for stripes, stars, or geometric divisions, while this one draws a picture of a place.
References
Government of Saint Lucia. "National Symbols". stlucia.gov.lc
Encyclopaedia Britannica. "Saint Lucia". britannica.com
Vexillology Research Centres. "Flags of the World". crwflags.com