The flag of Greece is based on nine equal horizontal stripes of blue alternating with white. There is a blue canton in the upper hoist-side corner bearing a white cross; the cross symbolises Greek Orthodoxy, the established religion of the people of Greece. The Greek flag was officially adopted by the First National Assembly at Epidaurus on 13 January 1822. Blue and white have many interpretations, symbolizing the colors of the famed Greek sky and sea, traditional colors of Greek clothes in the islands and the mainland.