Who knew? The Doug flag is one of the primary symbols of the Cascadian movement in the Pacific Northwest of North America. The blue of the flag represents the sky, Pacific Ocean, Salish Sea and inland waters, the white represents snow and clouds and the green represents the evergreen forests and fields. The tree is a Douglas-fir, which symbolizes endurance, defiance and resilience. Collectively the symbols of colors are meant to represent the region and movement for independence.