This is the flag of British Columbia, derived from the centre shield in the province's coat of arms. The rendition of the Union Flag, defaced in its centre by a crown, represents the province's origins as a British colony. The wavy white and blue lines symbolize the Pacific Ocean, and the setting sun represents the fact that British Columbia is Canada's westernmost province.
The British Columbia flag was first flown on June 14, 1960, on board a B.C. Ferry vessel.