The flag of L'Île-d'Olonne, a commune in the Vendée département in the Pays de la Loire region in western France. A flag with an offset, latin, or nordic cross in white on blue field. The boat and two white triangles from the commune's coat of arms are in the upper canton at the hoist. This is a vectorization of the image found at: https://drapeaux-sfv.org/drapeaux-de-france/article/drapeaux-municipaux
Own work using elements of File:Blason Île-d'Olonne.svg
Shorepine