Flag of the Province of Isabela, Philippines
Elements and design from https://archive.org/details/SymbolsOfTheStateRepublicOfThePhilippines/page/n179/mode/2up: https://www.provinceofisabela.ph; and https://commons.wikimedia.org/wiki/File:PH-ISA_Flag.png
Provincial Government of Isabela and the National Historical Commission of the Philippines