Flags of the provinces of the Philippines

The flags of the provinces of the Philippines are the vexillological devices used by various provincial-level local government units (LGUs) of the country. == Designs == The most common provincial flag design is a plain field of a single color with the provincial seal placed in the center; of this design the most prevalent field color used is white, followed by shades of yellow, of green and of blue.

Source: Wikipedia — Flags of the provinces of the Philippines (CC BY-SA 4.0)